id,summary,reporter,owner,description,type,status,component,version,severity,resolution,keywords,cc,stage,has_patch,needs_docs,needs_tests,needs_better_patch,easy,ui_ux 7887,Allow empty constants in templates,Joost Cassee,nobody,"The {{{Variable}}} class does not accept empty constants ("""") in templates. The error message is: {{{ Could not find variable at start of """" }}} I traced the error to the {{{__init__}}} method of {{{FilterExpression}}}. The attached diff fixes the error. I think some of the surrounding {{{if }}} statements should also be rewritten as {{{if is not None}}}, but the diff is restricted to fixing this bug.",,closed,Template system,dev,,duplicate,,,Unreviewed,1,0,0,0,0,0