updated ErrorHandler to check for existing output buffers befor ob_clean

exception/ErrorHandler.php

@@ -19,9 +19,11 @@ class ErrorHandler
 
     static public function error_handler($errno, $errstr, $errfile, $errline)
     {
-        ob_clean();
+        $ob_handlers = ob_get_status();
+        if (!empty($ob_handlers)) {
+            ob_end_clean();
+        }
         throw new ErrorException($errstr, 0, $errno, $errfile, $errline);
-        return false;
     }
 
     static protected function getSource($file, $hiline)
@@ -71,7 +73,10 @@ class ErrorHandler
      */
     static public function showDebug($exception)
     {
-        ob_clean();
+        $ob_handlers = ob_get_status();
+        if (!empty($ob_handlers)) {
+            ob_end_clean();
+        }
         $class = get_class($exception);
 
         $method = Env::Server('REQUEST_METHOD', '');