Source synching gives an error on expired surveys in a newly attached source

[roelfaber]

A new source was added with surveys of which some were expired.
When this source was synchronized:
• ERROR!!!
• While calling:runTask(Tracker_CheckSurvey,2,413989,,1)
• Mysqli statement execute error : Field 'gsu_survey_name' doesn't have a default value
• Mysqli statement execute error : Field 'gsu_survey_name' doesn't have a default value

When removing expired date from survey with sid 413989 the sync completes without errors.
After that, restoring the expired date gives no errors anymore. (this is the workaround).