[MNG-6982] PluginParameterExpressionEvaluator fails with NPE if created without MojoExecution
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Description
**[Falko Modler](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=famod)** opened **[MNG-6982](https://issues.apache.org/jira/browse/MNG-6982?redirect=false)** and commented
This constructor of PluginParameterExpressionEvaluator is not requiring a MojoExecution parameter:
https://github.com/apache/maven/blob/78f605e377a6450828e8b3e516d132e6797603df/maven-core/src/main/java/org/apache/maven/plugin/PluginParameterExpressionEvaluator.java#L96-L99
But if created this way, the evaluator will fail with a NullPointerException while trying to get the MojoDescriptor here:
https://github.com/apache/maven/blob/78f605e377a6450828e8b3e516d132e6797603df/maven-core/src/main/java/org/apache/maven/plugin/PluginParameterExpressionEvaluator.java#L205
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**Affects:** 3.6.3
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