Ipp test is not skipped for resolution attribute.

[sahusara]

ipptool: Bad resolution value "" on line 14 of 'resolution.test'.

Here is the content of resolution.test file.

{
	SKIP-IF-NOT-DEFINED PRINTER_RESOLUTION
	NAME "Validate-Job: resolution"
	OPERATION Validate-Job
	GROUP operation-attributes-tag
	ATTR charset attributes-charset utf-8
	ATTR naturalLanguage attributes-natural-language en
	ATTR uri printer-uri $uri
	ATTR name requesting-user-name $user
	ATTR mimeMediaType document-format application/octet-stream
	
	GROUP job-attributes-tag
	ATTR resolution printer-resolution $PRINTER_RESOLUTION
	# ATTR keyword sides $PRINTER_RESOLUTION #This line is for testing if the test is skipped.

	STATUS successful-ok
}

run this using below command to reproduce the issue.
ipptool -vt ipp:///ipp/print resilution.test

By defining PRINTER_RESOLUTION test case passes but how to skip the resolution.
ipptool -vt ipp:///ipp/print -d PRINTER_RESOLUTION=600dpi resilution.test

Note: It works for the keyword attribute.

[michaelrsweet]

This is probably because an empty string is a valid keyword value but not a valid resolution value... Will see what we can do here...

[michaelrsweet]

[master 4816d4c] Allow empty string for resolution values (Issue #63)