Baremaps init with no options show no message

[RemiDesgrange]

baremaps init with no options return code 0 and no message.

Maybe a message if style and tileset are null?

[bchapuis]

Good idea. Telling that the command did nothing is probably sufficient.

An alternative may be to set default values for the style and the tileset, but I'm not sure that the user always want to create both files. What do you think?

[RemiDesgrange]

Telling the user that the command did nothing seem sufficient to me.

[bchapuis]

Solved in #804