RemoteLRS::sendRequest generates undefined variable warnings if the host cannot be reached

[jamarr81]

If you instantiate a RemoteLRS object and the LRS host is down, or the URL points to a non-LRS endpoint, etc. and then try to send a statement via RemoteLRS::saveStatement a couple of 'Notice: Undefined variable' exceptions are generated.

One for $fp on line 149. This is because $fp is (currently) only defined within the preceeding try block, and if an exception is generated here, then $fp goes undefined.

The other is for $response on line 182. This is because $response is only defined within the block that checks for $fp being truthy (mentioned above).

changset d634afb seems to have introduced these problems.