New year!
Merge pull request #1392 from MaciejCzyzewski/patch-1

New year!
assign value to new arrays at creation in _.groupBy
Merge pull request #1394 from mcbex/master

assign value to new arrays at creation in _.groupBy
fixes #1390: make _.where consistent when used with empty attrs object
Merge pull request #1395 from michaelficarra/GH-1390

fixes #1390: make _.where consistent when used with empty attrs object
Tape tests.