Fix various NPEs caused by dynamically computed method calls #1704
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Groovy method calls where the method name is an interpolated string (for example
"${foo}"(...)
) are currently causing NPEs in various places. Autocompletion doesn't work in the entire file when such a call is used anywhere in a build.gradle file. The problem is that "MethodCallExpression.getMethodAsString()" returns null for these dynamic method calls.I have mostly moved constant strings to the front of equals comparisons to avoid the NPEs. In some cases I have replaced "getMethodAsString()" by "getMethod().getText()", which is not null.
This fixes #1562.