Fix: tools: Don't output "(null)" in crm_attribute's quiet mode.
If the attribute queried for has no value, simply do not output
anything.
Regression in 2.1.3 introduced by 8c03553bbf
Fixes T502
See: rhbz#2099331
Fix: tools: Don't output "(null)" in crm_attribute's quiet mode. Tags None Referenced Files None Subscribers None
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