[views/forms] Fix EntityFieldsForm.link_to when parent entity is being created When the parent entity is being created and the inlined form is displayed, the parent entity has no eid yet and `peid` is usually 'A'. So int() raises a ValueError. Closes #4627739.

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import ConfigParser

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try:

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    undo_actions = config.cfgfile_parser.get('MAIN', 'undo-support', False)

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except ConfigParser.NoOptionError:

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    pass # this conf. file was probably already migrated

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else:

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    config.global_set_option('undo-enabled', bool(undo_actions))