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Do not create glyph textures with no height/width

This should fix the issue with cute_spritebatch.h, described in #116.

--- a/src/Font.cpp

+++ b/src/Font.cpp

@@ -1012,17 +1012,18 @@

 						break;

 				}

-				glyph->backend = RenderBackend_LoadGlyph(bitmap.buffer, bitmap.width, bitmap.rows, bitmap.pitch);

+				// Don't bother loading glyphs that don't have an image (causes `cute_spritebatch.h` to freak-out)

+				if (bitmap.width == 0 || bitmap.rows == 0)

+					glyph->backend = NULL;

+				else

+					glyph->backend = RenderBackend_LoadGlyph(bitmap.buffer, bitmap.width, bitmap.rows, bitmap.pitch);

 				FT_Bitmap_Done(font_object->library, &bitmap);

-				if (glyph->backend != NULL)

-				{

-					glyph->next = font_object->glyph_list_head;

-					font_object->glyph_list_head = glyph;

+				glyph->next = font_object->glyph_list_head;

+				font_object->glyph_list_head = glyph;

-					return glyph;

-				}

+				return glyph;

 			}

 			FT_Bitmap_Done(font_object->library, &bitmap);

@@ -1041,7 +1042,9 @@

 	{

 		CachedGlyph *next_glyph = glyph->next;

-		RenderBackend_UnloadGlyph(glyph->backend);

+		if (glyph->backend != NULL)

+			RenderBackend_UnloadGlyph(glyph->backend);

+

 		free(glyph);

 		glyph = next_glyph;