Ginny Marvin says, “Beginning the week of September 12, new keywords and keywords that haven’t received any recent clicks and impressions will have a reported Quality Score in AdWords of null, represented by dashes (“–“).

By default, any keywords with null Quality Scores will be excluded from reports and automated rules that have Quality Score filters unless you check a new box that will appear with this change to include them. Google recommends reviewing any reports, filters, rules and scripts that include Quality Score before September 12 to be sure they will function properly”.

Google will soon report null Quality Scores for new & low-activity keywords

Search Engine Land

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