You can use a RPE variable and assign true/false value to it based on whether the package has diagrams in it or not.
Use 2 containers - one to print diagrams (with condition hasDiagrams=="true") and another with Text element that prints "NA" (with condition hasDiagrams=="false").
Within the query that gives the diagrams, set the variable value to true and reset it to false outside the query (after printing the text "NA" based on condition hasDiagrams=="false". Attaching the screenshot for reference.
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