While processing --avoid channel tags, do not stop at first channel failure

[BhaagBoseDK]

Current behaviour (10.7.6)
bos rebalance --avoid channel1 --avoid channel2 [....] -- avoid channel-n

as soon as an invalid channel is found the application stops with error

404, 'FailedToFindChannelToAvoid'

Instead, the application can parse all --avoid flags to ensure there are no other errors so that in next run all of them can be corrected in one go.

[BhaagBoseDK]

created pull request #124

[alexbosworth]

You can use the edge format for avoiding and that will not terminate

[Jones098]

Thanks for updating