New QTC_CHECK warning replacing QTC_ASSERT(x, /**/)

Warn if the condition fails, but otherwise don't change the execution
flow.

Change-Id: Id7b14c745109b66960add967b2a4ef8d31e1a546
Reviewed-on: http://codereview.qt.nokia.com/2389
Reviewed-by: Eike Ziller <eike.ziller@nokia.com>

src/plugins/perforce/perforcesubmiteditor.cpp

@@ -133,7 +133,7 @@ void PerforceSubmitEditor::updateFields()
     lines.removeLast(); // that is the empty line at the end
 
     const QRegExp leadingTabPattern = QRegExp(QLatin1String("^\\t"));
-    QTC_ASSERT(leadingTabPattern.isValid(), /**/);
+    QTC_CHECK(leadingTabPattern.isValid());
 
     lines.replaceInStrings(leadingTabPattern, QString());
     widget->setDescriptionText(lines.join(newLine));