Fix crash when looking at NodeInfo 1.0 document without metadata.nodeName
Fix crash when looking at NodeInfo 1.0 document without metadata.nodeName

Some server produces a NodeInfo 1.0 without nodeName which we rely on.
Catch the error to not crash the whole update process.

Refs: #124

jaywink/the-federation.info,Flaburgan/the-federation.info,Flaburgan/the-federation.info,Flaburgan/the-federation.info,Flaburgan/diaspora-hub,Flaburgan/diaspora-hub,Flaburgan/diaspora-hub,jaywink/the-federation.info,jaywink/diaspora-hub,jaywink/diaspora-hub,jaywink/diaspora-hub,jaywink/the-federation.info,Flaburgan/the-federation.info