TypeError: Cannot read property 'map' of undefined

[sdgluck]

Kasia attempts to find data in the store even when an error has occurred during a request for data. This throws an uncaught error...

uncaught at watchRequests 
 at fetch 
 TypeError: Cannot read property 'map' of undefined

And comes from the first line of this function in connectWpQuery.js:

function findEntities (entities, identifiers) {
  identifiers = identifiers.map(String); // <-- error!
  //...
}

Need to 1) prevent finding entities if an error occurs and 2) provide feedback of error to developer.

[sdgluck]

Fixed in v3.1.5 and feedback given in v3.2.0