document_has_value? should return false if the value is blank

[mattcg]

Currently, if the document has a key but the value is blank (an empty string, for example) or an empty array on a multivalued field, document_has_value? will still return true. This results in a kind of ugly mess of empty fields:

[cbeer]

Hm. That seems weird. Are you using highlight fields or model accessors, by any chance?

[mattcg]

Highlight fields.

Another problem that perhaps needs to be kept in mind is that if you're using hl.defaultSummary and the field starts with a lot of white space, all the whitespace characters will be encoded to HTML entity equivalents by the pipeline, so a call to strip.blank? will still yield false in helpers.

[barmintor]

cf #1388