Fixed issue with multi value filters and not in

Civi/DataProcessor/DataFlow/SqlDataFlow/MultiValueFieldWhereClause.php

@@ -50,6 +50,7 @@ class MultiValueFieldWhereClause extends AbstractWhereClause implements WhereCla
       $this->value = array($this->value);
     }
     $combine = "OR";
+    $includeNullStatement = false;
     foreach($this->value as $value) {
       $escapedValue = '';
       try {
@@ -61,18 +62,23 @@ class MultiValueFieldWhereClause extends AbstractWhereClause implements WhereCla
         case 'LIKE':
         case 'IN':
         case '=':
-          $clauses[] = "(`$this->table_alias`.`$this->field` LIKE  '$compareValue')";
+          $clauses[] = "`$this->table_alias`.`$this->field` LIKE  '$compareValue'";
           break;
         case 'NOT LIKE':
         case 'NOT IN':
         case '!=':
+          $includeNullStatement = true;
           $combine = "AND";
-          $clauses[] = "(`$this->table_alias`.`$this->field` NOT LIKE '$compareValue')";
+          $clauses[] = "`$this->table_alias`.`$this->field` NOT LIKE '$compareValue'";
           break;
       }
     }
     if (count($clauses)) {
-      return "(" . implode(" $combine ", $clauses) . ")";
+      $extraStatement = "";
+      if ($includeNullStatement) {
+        $extraStatement .= " OR `$this->table_alias`.`$this->field` IS NULL";
+      }
+      return "(" . implode(" $combine ", $clauses) . ")" . $extraStatement;
     }
     return "";
   }