Solvedmaterial md-autocomplete: Cannot read property 'then' of undefined

In version 1.0.7 I get this error when typing in md-autocomplete:

angular.js:13550 TypeError: Cannot read property 'then' of undefined

The error seems NOT to happen in a previous version. More detailed explanation is on StackOverflow.

That's a f ridiculous issue: isPromise = items && items.then;
It makes me reconsider the experience of people I'm trusting on.

I had the same error caused by following query function:

function querySearch(searchText) { if (!searchText) return; ... }

The fix was to return an empty array in case of an empty searchText.

This issue is first in google ( "angular autocomplete Cannot read property 'then' of undefined" ). I think it may help some people:

This error occures also when you use function that does not exist, like:

md-items="item in notExistingFunction(query)"

and there is no other information in error stack (angular digest.. and then 'cannot read prop...').

@marcioaso

https://material.angularjs.org/latest/api/directive/mdAutocomplete

• md-items expression
  An expression in the format of item in items to iterate over matches for your search.

!!items.then - items must be defined, as every variable over which you can iterate
Checking if items exists would be an issue - waste of CPU (I'm not sure about it) and code not according to documentation.