[eclipselink-dev] Fix for bug 306068 checked into 1.2

[David Minsky <david.minsky@xxxxxxxxxx>]

Fix for bug 306068 - NPE in 
ParameterExpression.validateParameterValueAgainstMapping for 
DirectCollectionMapping

https://bugs.eclipse.org/bugs/show_bug.cgi?id=306068

Added null check in ParameterExpression 
validateParameterValueAgainstMapping to prevent NullPointerException, 
same code is present in 2.0 and trunk (backport to 1.2).

Reviewed: Chris Delahunt

Tests: LRG & JPA FullRegressionTestSuite (ok)

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