misc: fix crash when getting status with unloaded plugin

If we have previously used the chathandler and it appears in the
allowDenyList but it is not loaded, we can have a crash.

Change-Id: I71fb4a94fdb074e36e535c2bc0776320eb5f51c0

src/plugin/chatservicesmanager.cpp

@@ -202,9 +202,10 @@ ChatServicesManager::getChatHandlerStatus(const std::string& accountId, const st
     std::vector<std::string> ret;
     if (it != allowDenyList_.end()) {
         for (const auto& chatHandlerName : it->second)
-            if (chatHandlerName.second) // We only return active ChatHandler ids
+            if (chatHandlerName.second && handlersNameMap_.find(chatHandlerName.first) != handlersNameMap_.end()) { // We only return active ChatHandler ids
                 ret.emplace_back(std::to_string(handlersNameMap_.at(chatHandlerName.first)));
             }
+    }
 
     return ret;
 }