Issue 2064: Do not show conditions with not supported operations

git-svn-id: http://xe-core.googlecode.com/svn/branches/1.5.0@10777 201d5d3c-b55e-5fd7-737f-ddc643e51545

classes/db/queryparts/condition/Condition.class.php

@@ -129,6 +129,9 @@
                                 case 'between' :
                                         if(!is_array($this->_value)) { $this->_show = false; break;}
                                         if(count($this->_value)!=2) {$this->_show = false; break;}
+								default:
+									// If operation is not one of the above, means the condition is invalid
+									$this->_show = false;
                             }
                         }
                     }