[spameater] fix debug line for SQL request failure
Created by: dingcycle
Context: an exception could be raised, within the execQuery
exception block, when one of the parameters was not a string (e.g. a number):
>>> ', '.join(['a',2,'c'])
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: sequence item 1: expected string, int found