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Fix Form fields with unexistant fonts in DA string

Nelson Benítez León requested to merge nbenitez/poppler:fix_1529 into master

It may happen that a Form field's DA string contains a font name that is non-existant, however this situation can be salvaged if the Form object has a DA string and that string contains a valid font.

That is so, because PDF spec describes a Form DA key as:
(Optional) A document-wide default value for the DA attribute of variable text fields.

We also added this same logic (defaulting to Form DA font when the normal DA font cannot be looked up) in function Form::ensureFontsForAllCharacters() so that entering non-latin text also works for such text fields.

Fixes #1529

Edited by Nelson Benítez León

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