[Fix] Url with only query is valid too

mailto:?subject=foo should be treated as valid url too

Closes #1112

src/lib/webview/webview.cpp

@@ -240,7 +240,7 @@ QWebElement WebView::activeElement() const
 bool WebView::isUrlValid(const QUrl &url)
 {
     // Valid url must have scheme and actually contains something (therefore scheme:// is invalid)
-    return url.isValid() && !url.scheme().isEmpty() && (!url.host().isEmpty() || !url.path().isEmpty());
+    return url.isValid() && !url.scheme().isEmpty() && (!url.host().isEmpty() || !url.path().isEmpty() || url.hasQuery());
 }
 
 QUrl WebView::guessUrlFromString(const QString &string)