Do not try to rescale recent file icon when it cannot be loaded
Do not try to rescale recent file icon when it cannot be loaded

Recent file icon loading may fail e.g. because of missing read
permission or other packaging issue.

Icon rescale code introduced by 5fc8d6c did not foresee this
possibility.

Add a condition to prevent it from manipulating a non-ok icon.

This prevents assertion error although icon loading failure will still
lead to an error message showed to user.

See #758.
alexhenrie/poedit,vslavik/poedit,nawawi/poedit,vslavik/poedit,alexhenrie/poedit,alexhenrie/poedit,nawawi/poedit,nawawi/poedit,vslavik/poedit,nawawi/poedit,nawawi/poedit,alexhenrie/poedit,vslavik/poedit,alexhenrie/poedit,vslavik/poedit