don't relu on callee + passed results

lib/dialects/abstract/query.js

@@ -141,10 +141,10 @@ module.exports = (function() {
   }
 
   var isInsertQuery = function(results) {
-    var result = !!this.callee
+    var result = true
 
     result = result && (this.sql.toLowerCase().indexOf('insert into') === 0)
-    result = result && !!results && results.hasOwnProperty('insertId')
+    result = result && (!results || results.hasOwnProperty('insertId'))
 
     return result
   }