Debugger: Fix removing breakpoints for pdb

...if the break point has not yet got a response id we
end up in an interactive prompt of pdb asking for the
breakpoint to remove. Avoid this as this leads to other
follow-up problems.

Change-Id: Ifa2b5385b61af6bf05b816c8e82d2b515525805b
Reviewed-by: hjk <hjk@qt.io>

src/plugins/debugger/pdb/pdbengine.cpp

@@ -264,6 +264,10 @@ void PdbEngine::removeBreakpoint(const Breakpoint &bp)
     QTC_ASSERT(bp, return);
     QTC_CHECK(bp->state() == BreakpointRemoveRequested);
     notifyBreakpointRemoveProceeding(bp);
+    if (bp->responseId().isEmpty()) {
+        notifyBreakpointRemoveFailed(bp);
+        return;
+    }
     showMessage(QString("DELETING BP %1 IN %2")
                 .arg(bp->responseId()).arg(bp->fileName()));
     postDirectCommand("clear " + bp->responseId());