Fix #1141 - L1 spawn issues

[shawntobin]

• Closes Address shows no Urbit IDs after L1 planet spawn to own address #1141
• The call to the roller was throwing an error for a newly spawned L1 point since it didn't yet know it existed. The try / catch block wasn't set up in a way to properly handle the error, so it wasn't checking the chain when the point couldn't be found in roller state.
• This fix checks the chain when the roller doesn't return the point, and if it exists then it returns the point using on-chain data.

[thelifeandtimes]

Thanks for looking into this. Looks like the right solution to me but will defer to @pkova to review/merge/deploy.