New error message always results in status problem

Previously, a new error message did not automatically result in a status
problem being shown. This patch fixes that.

src/detectorTowerController.cpp

@@ -838,7 +838,8 @@ asynStatus detectorTowerController::pollDetectorAxes(
     getStringParam(angleAxisNo, motorMessageText(), sizeof(waitingErrorMessage),
                    waitingErrorMessage);
 
-    if (error != 0 || waitingErrorMessage[0] != '\0') {
+    if (error != 0 || errorMessage[0] != '\0' ||
+        waitingErrorMessage[0] != '\0') {
 
         plStatus = angleAxis->setIntegerParam(motorStatusProblem(), true);
         if (plStatus != asynSuccess) {