exp_imgv.adb (Expand_Image_Attribute): Defend against bad use in HIE mode, avoids compilation abandoned message

	* exp_imgv.adb (Expand_Image_Attribute): Defend against bad use
        in HIE mode, avoids compilation abandoned message

	* exp_imgv.adb: Correct typo in previous change

	* exp_imgv.adb: Correct typo in previous change (not my day!)

From-SVN: r46501