gui: set the scale only when there is a preview object.
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@ -83,7 +83,7 @@ _scale_changed_cb(void *data EINA_UNUSED, Evas_Object *obj,
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v = (double)(int)round(val * 10.0) / 10.0;
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if (v != val) elm_slider_value_set(obj, v);
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elm_object_scale_set(preview_obj, v);
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if (preview_obj) elm_object_scale_set(preview_obj, v);
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INF("scale changed : %f %f", val, v);
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}
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