Only display secondary Text in grid delegate if there is secondry text

Just because we *can* display secondry text, doesn't mean we *will.* So
check for that too. Fixes a common console warning.
2 jobs for master in 10 minutes and 55 seconds (queued for 10 minutes and 14 seconds)
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passed linux kf5-qt5 qt5.15 #99608

00:10:30

85.0%
passed reuse #99607

00:00:24