[FIX] web: DebounceField: do nothing after widget destruction

DebounceFields debounce the function that notify field changes to
their environment (using _.debounce). It may happen that this
function is called once the field widget is destroyed (e.g.
type something in a char field and quickly click on Save, the
function is called directly by _commitChanges, but the debounced
call is still pending). It may be a problem if the subsequent
code does something like this.getSession().some_key, as if the
widget is destroyed, it has no parent that can provide it the
session, and thus it crashes.

Also rename attribute _debouncedStarted into _isDirty as it makes
much more sense.

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