angular-rangeslider
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UPDATED gracefully handle deleting modelMax through input
When modelMax is deleted, e.g. by a user pushing backspace when focused on an input field which has ng-model set to modelMin or modelMax, then modelMax is are set to 0 or modelMin.
This fixes the issue that happens when trying to delete the last cipher from an input field - the value just resets to max.
fixed so the changes only occur when modelMax is not pinned.