Fix (Typeahead): Typeahead shows list on focus when minLenth is 0. #1918
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Fixes #1559
Currently typeahead does not show list on focus when typeaheadMinLength="0" even is such behaviour is documented.
onFocus method is comparing minLength with 0, while the angular sets input property to string '0' and no event is emitted.
Fixed the issue by replacing === with == in the comparison.