improve ConditionPicker#is_too_complex

[iscke]

Currently, is_too_complex requires condition.count('==') == 1 and condition.count('>') != 1 etc for a condition to be complex, meaning you need something like == != <= >= in your expression for it to be counted as complex. This changes the requirement to being empty or having a single comparison operator, which is closer to what the simple condition editor and complex2simple use.

[iscke]

(the specific issue i've encountered with this is if you write a condition that's not parsable by complex2simple, like SomeGlobal.returns_a_bool() and then restart your editor, Dialogic sees it as a simple condition and then fails to convert it back, turning it into the blank == simple condition.)

[Jowan-Spooner]

Thanks, looks good to me!