Removed an old comment from several template files.
Modified bibulous.py's handling of citation keys that are missing from the database.

Where before bibulous did not even create an entrykey for this case, now it creates a default entrykey and fills it with minimal info plus an error message. This allows all of the code to treat it normally, simplifies the code logic a little, and allows the output to insert the entry error message at its proper place in the citation list.

Also modified test1 in the testing suite to accommodate the change.