is_datetime: fixed issue with TRADITIONAL sql_mode making function exit on error; now returning FALSE in case of error.
is_datetime: fixed issue with TRADITIONAL sql_mode making function exit on error; now returning FALSE in case of error.

git-svn-id: bf9c1e153a520e62e214c071abac674e79383ca0@420 c8a82860-ae11-f3b5-05a3-c0c726401f9a

shlomi-noach/common_schema