No search on enter if filters are unchanged #1631

Fixing #1631 by not treating the enter key as a key press and thus not executing the search if enter is pressed while no filters were changed.

js/jquery.tablesorter.widgets.js

@@ -1288,7 +1288,7 @@
 					event.preventDefault();
 					// init search with no delay
 					$( this ).attr( 'data-lastSearchTime', new Date().getTime() );
-					tsf.searching( table, eventType !== 'keypress', true, column );
+					tsf.searching( table, eventType !== 'keypress' || event.which === tskeyCodes.enter, true, column );
 				}
 			});
 		},