Fixed issue #03328: bug in conditions based on multiple choices questions in question-by-question survey format. This bug could also affect group by group surveys in some cases.
Dev: this is an intrusive fix, please help me test it. it could also solve issue #3305 (to be tested)

git-svn-id: file:///Users/Shitiz/Downloads/lssvn/source/limesurvey@7082 b72ed6b6-b9f8-46b5-92b4-906544132732