Debugger: Fix soft assertion

SOFT ASSERT: "!m_id.isValid()" in file .../debuggeritem.cpp, line 92

Introduced in 5b5a7d1dea

Change-Id: I82416302402770d885f8eb96b6966294a5368cbe
Reviewed-by: hjk <hjk121@nokiamail.com>

src/plugins/debugger/debuggeritemmanager.cpp

@@ -389,7 +389,10 @@ QVariant DebuggerItemManager::registerDebugger(const DebuggerItem &item)
         }
     }
 
-    // Nothing suitable. Create a new id and add the item.
+    // If item already has an id, add it. Otherwise, create a new id.
+    if (item.id().isValid())
+        return addDebugger(item);
+
     DebuggerItem di = item;
     di.createId();
     return addDebugger(di);