Affects PMD Version: 6.3.0+, 7.0.0

Rule: NullAssignment

Description:
If there is a variable declaration without initializer, then the first assignment with null is considered already as a NullAssignment. This should be ignored, since it is the first assignment, which should be allowed by the rule.

Code Sample demonstrating the issue:

String key;
if (a) {
	key = "a";
} else if (b) {
	key = "b";
} else {
	key = null;
}

See #629 for the original issue.

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