scxml editor force event id to transitions

When scxml editor open a file containing an eventless transition (i.e. lacking the 'event' attribute) it force the event id to a default one (i.e Transition_1)

Since using "*" event id is not a workaround and eventless transitions works correctly in Qt scxml, I suggest to remove this behavior from editor.

from www.w3.org/TR/scxml:

"An event designator consisting solely of "*" can be used as a wildcard matching any sequence of tokens, and thus any event. Note that this is different from a transition lacking the 'event' attribute altogether. Such an eventless transition does not match any event, but will be taken whenever its 'cond' attribute evaluates to 'true'."