964950a8b9
Prior to gh-30325, supplying a null reference for a SpEL expression was effectively equivalent to supplying the String "null" as the expression. Consequently, evaluation of a null reference expression always evaluated to a null reference. However, that was accidental rather than by design. Due to the introduction of the checkExpressionLength(String) method in InternalSpelExpressionParser (in conjunction with gh-30325), an attempt to evaluate a null reference as a SpEL expression now results in a NullPointerException. To address both of these issues, TemplateAwareExpressionParser.parseExpression() and SpelExpressionParser.parseRaw() now reject null and empty SpEL expressions. See gh-30371 Closes gh-30373
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