evas: proceed glyph iterator to handle next index properly

evas: proceed glyph iterator to handle next index properly

Summary:
When harfbuzz is enabled, _content_create_ot() function will be used
for shaping. If evas_common_font_int_cache_glyph_get() failed in some reason,
it never proceed gl_itr until the end.
It can cause weird rendering result. Because, all of gl_itr after the failure
can't have proper x_bear, y_bear and width.
@fix

Test Plan: N/A

Reviewers: raster, cedric, herdsman, jpeg

Differential Revision: https://phab.enlightenment.org/D5154