`channeling` condition can contain whitespace

[silverwind]

Given the following macro:

/stopmacro [channeling:shifting power]

The addon higlights this channeling condition as an error "Arguments must be alphanumeric", while it is actually fine and only works with the space character.

Another related bug is when clicking "Shorten", it changes the condition to channeling:shiftingpower, which also breaks the macro.