Fix NULL pointer crash in ScanParams::slotNewResolution()
Happens when looking up the current scan resolution if the SANE_NAME_SCAN_RESOLUTION and SANE_NAME_SCAN_X_RESOLUTION option names are not the same and the scanner only has the former. They were equivalent in SANE 1.0.19, but in 1.0.20 they are different. BUG:264768
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9637cf61
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