evas: behave nicely with unitialized data.

CID 1210818

It would be a better and more working fix to use Evas_GL_Image, sadly
no time to do it right now and may be to intrusive for an alpha release.

src/modules/evas/engines/gl_common/evas_gl_3d.c

@@ -171,7 +171,7 @@ e3d_texture_file_set(E3D_Texture *texture, const char *file, const char *key)
           color_format = EVAS_3D_COLOR_FORMAT_RGBA;
           break;
         default:
-          break;
+          return;
      }
    e3d_texture_data_set(texture, color_format, pixel_format, im->cache_entry.w,
                         im->cache_entry.h, im->image.data);