preventing crashes for output=[]

stamparm · stamparm · commit c0233dcd4f34 · 2011-02-07T10:24:15.000Z
diff --git a/lib/takeover/udf.py b/lib/takeover/udf.py
@@ -95,10 +95,10 @@ def udfEvalCmd(self, cmd, first=None, last=None, udfName=None):
         output = inject.getValue("SELECT %s FROM %s" % (self.tblField, self.cmdTblName), resumeValue=False, firstChar=first, lastChar=last)
         inject.goStacked("DELETE FROM %s" % self.cmdTblName)
 
-        if isinstance(output, (list, tuple)):
+        if output and isinstance(output, (list, tuple)):
             output = output[0]
 
-            if isinstance(output, (list, tuple)):
+            if output and isinstance(output, (list, tuple)):
                 output = output[0]
 
         return output
