ClangTools: Give a hint to users as to why we didn't do anything

Task-number: QTCREATORBUG-25565
Change-Id: I27cb0e5bc2a02a88ddf1d42b996e45840d6c1385
Reviewed-by: David Schulz <david.schulz@qt.io>

src/plugins/clangtools/clangtoolsplugin.cpp

@@ -60,6 +60,7 @@
 #include <projectexplorer/kitinformation.h>
 #include <projectexplorer/projectpanelfactory.h>
 #include <projectexplorer/target.h>
+#include <projectexplorer/taskhub.h>
 
 #include <QAction>
 #include <QDebug>
@@ -114,6 +115,8 @@ bool ClangToolsPlugin::initialize(const QStringList &arguments, QString *errorSt
     Q_UNUSED(arguments)
     Q_UNUSED(errorString)
 
+    TaskHub::addCategory(taskCategory(), tr("Clang Tools"));
+
     // Import tidy/clazy diagnostic configs from CppTools now
     // instead of at opening time of the settings page
     ClangToolsSettings::instance();