This commit has to be a joke. There's no way this fixes a real bug.

Summary:
Some group metadata on items was saved as `null`, which React
doesn't convert into the default prop value (it does convert
`undefined` into the default). While not ideal, this commit
makes the StubGroupEditor handle that case.

We can probably get rid of this if we went through and saved all
those items again, since they would get metadata: undefined, but
this will let those load (and then we could save them if it's
important to get rid of this).

Test Plan:
Load [this item](http://localhost:9000/test.html#content=%7B%22question%22%3A%7B%22content%22%3A%22%5Cn%5Cn%5B%5B%E2%98%83%20passage%201%5D%5D%5Cn%5Cn%5B%5B%E2%98%83%20passage%202%5D%5D%5Cn%5Cn%5B%5B%E2%98%83%20group%201%5D%5D%5Cn%5Cn%5B%5B%E2%98%83%20group%202%5D%5D%5Cn%5Cn%5B%5B%E2%98%83%20group%203%5D%5D%5Cn%5Cn%5B%5B%E2%98%83%20group%204%5D%5D%5Cn%5Cn%5B%5B%E2%98%83%20group%205%5D%5D%5Cn%5Cn%5B%5B%E2%98%83%20group%206%5D%5D%5Cn%5Cn%5B%5B%E2%98%83%20group%207%5D%5D%5Cn%5Cn%5B%5B%E2%98%83%20group%208%5D%5D%5Cn%5Cn%5B%5B%E2%98%83%20group%209%5D%5D%5Cn%5Cn%5B%5B%E2%98%83%20group%2010%5D%5D%5Cn%5Cn%5B%5B%E2%98%83%20group%2011%5D%5D%5Cn%5Cn%5B%5B%E2%98%83%20group%2012%5D%5D%5Cn%5Cn%22%2C%22images%22%3A%7B%7D%2C%22widgets%22%3A%7B%22passage%201%22%3A%7B%22type%22%3A%22passage%22%2C%22graded%22%3Atrue%2C%22options%22%3A%7B%22passageTitle%22%3A%22Passage%201%22%2C%22passageText%22%3A%22String%20theory%20is%20a%20work%20in%20progress%20whose%20partial%20completion%20has%20already%20revealed%20remarkably%20elegant%20answers%20to%20uestions%20about%20nature%E2%80%99s%20most%20fundamental%20constituents%20and%20forces.%20For%20instance%2C%20in%20string%20theory%20many%20aspects%20of%20nature%20that%20might%20appear%20to%20be%20arbitrary%20technical%20details%E2%80%94such%20as%20the%20number%20of%20distinct%20varieties%20of%20particle%20ingredients%20and%20their%20properties%E2%80%94are%20found%20to%20arise%20from%20tangible%20aspects%20of%20the%20geometry%20of%20the%20universe.%20%5Cn%5Cn%7B%7BIn%20the%20final%20analysis%2C%20though%2C%20nothing%20is%20a%20substitute%20for%20definitive%2C%20testable%20predictions%20that%20can%20determine%20whether%5Cnstring%20theory%20has%20truly%20lifted%20the%20veil%20of%20mystery%20hiding%20the%5Cndeepest%20truths%20of%20our%20universe.%7D%7D%20It%20may%20be%20some%20time%20before%20our%20level%20of%20comprehension%20has%20reached%20sufficient%20%20depth%20to%20achieve%20this%20aim.%20In%20fact%2C%20the%20mathematics%20of%20string%20theory%20is%20so%20complicated%20that%2C%20to%20date%2C%20no%20one%20even%20knows%20the%20exact%20equations%20of%20the%20theory.%20%7B%7BNevertheless%2C%20experimental%20tests%20could%20provide%20strong%20circumstantial%20support%20for%20string%20theory%20within%20the%20next%20ten%20years%20or%20so.%7D%7D%5Cn%5CnOne%20of%20the%20pioneers%20of%20string%20theory%20summarizes%20the%20situation%20by%20saying%20that%20%E2%80%9Cstring%20theory%20is%20a%20part%20of%20twenty-first-century%20physics%20that%20fell%20by%20chance%20into%20the%20twentieth%20%5Cncentury.%E2%80%9D%20%7B%7BIt%20is%20as%20if%20our%20forebears%20in%20the%20nineteenth%20century%20had%20been%20presented%20with%20a%20modern-day%20supercomputer%2C%20without%20the%20operating%20instructions.%20Through%20inventive%20trial%20and%20error%2C%20hints%20of%20the%20supercomputer%E2%80%99s%20power%20would%20have%20become%20evident%2C%20but%20it%20would%20have%20taken%20vigorous%20and%20prolonged%20effort%20to%20gain%20true%20mastery.%20The%20hints%20of%20the%20computer%E2%80%99s%20potential%2C%20like%20our%20glimpses%20of%20string%20theory%E2%80%99s%20explanatory%20power%2C%20would%20have%20provided%20strong%20motivation%20for%20obtaining%20complete%20facility.%20A%20similar%20motivation%20today%20energizes%20physicists%20to%20pursue%20string%20theory.%7D%7D%20%5Cn%5CnScience%20proceeds%20in%20%7B%7Bfits%7D%7D%20and%20starts.%20Scientists%20put%20%5Cnforward%20results%2C%20both%20theoretical%20and%20experimental.%20The%20%5Cnresults%20are%20then%20debated%20by%20the%20community%3B%20sometimes%20they%20%5Cnare%20discarded%2C%20sometimes%20they%20are%20modified%2C%20and%20sometimes%20%5Cnthey%20provide%20inspiration%20for%20new%20and%20more%20accurate%20ways%20%5Cnof%20understanding%20the%20universe.%20In%20other%20words%2C%20science%20%5Cnproceeds%20along%20a%20zigzag%20path%20toward%20what%20we%20hope%20will%20be%20%5Cnultimate%20truth%2C%20a%20%7B%7Bpath%7D%7D%20that%20began%20with%20humanity%E2%80%99s%20earliest%20attempts%20to%20fathom%20the%20cosmos%20and%20whose%20end%20we%20cannot%20predict.%20Whether%20string%20theory%20is%20an%20incidental%20rest%20stop%20along%20this%20path%2C%20a%20landmark%20turning%20point%2C%20or%20the%20final%20%5Cndestination%20we%20do%20not%20know.%20But%20the%20last%20two%20decades%20%5Cnof%20research%20by%20hundreds%20of%20dedicated%20%7B%7Bphysicists%20and%20%5Cnmathematicians%7D%7D%20has%20given%20us%20well-founded%20hope%20that%20%5Cnwe%20are%20on%20the%20right%20and%20possibly%20final%20track.%22%2C%22footnotes%22%3A%22%22%2C%22showLineNumbers%22%3Atrue%7D%2C%22version%22%3A%7B%22major%22%3A0%2C%22minor%22%3A0%7D%7D%2C%22passage%202%22%3A%7B%22type%22%3A%22passage%22%2C%22graded%22%3Atrue%2C%22options%22%3A%7B%22passageTitle%22%3A%22Passage%202%22%2C%22passageText%22%3A%22%7B%7BNo%20matter%20how%20things%20turn%20out%2C%20the%20story%20of%20string%20theory%20%5Cnis%20an%20episode%20with%20no%20parallel%20in%20the%20history%20of%20modern%20%5Cnphysics.%20More%20than%20twe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with no errors.

Auditors: joel