Merge "Make sure path is not NULL to avoid fatal exception."

am: e0e5bfeb3c

* commit 'e0e5bfeb3c49419ceb53d2ea2b7410ddcfab35c5':
  Make sure path is not NULL to avoid fatal exception.

VolumeManager.cpp

@@ -283,8 +283,8 @@ void VolumeManager::handleBlockEvent(NetlinkEvent *evt) {
         evt->dump();
     }
 
-    std::string eventPath(evt->findParam("DEVPATH"));
-    std::string devType(evt->findParam("DEVTYPE"));
+    std::string eventPath(evt->findParam("DEVPATH")?evt->findParam("DEVPATH"):"");
+    std::string devType(evt->findParam("DEVTYPE")?evt->findParam("DEVTYPE"):"");
 
     if (devType != "disk") return;