fix(gradle): Also check for non-empty resolution alternatives

Starting with Gradle 8.2, a property that defines if a
Gradle configuration is deprecated can be an empty
list instead of just null. This is misinterpreted by the
Gradle analyzer plugin, and all Gradle configurations
are considered deprecated. As a result, no dependencies
for Gradle configurations are returned.

Fixes #9255.

Signed-off-by: Wolfgang Klenk <wolfgang.klenk2@bosch.com>

plugins/package-managers/gradle/src/main/resources/init.gradle

@@ -409,7 +409,7 @@ class AbstractOrtDependencyTreePlugin<T> implements Plugin<T> {
  // available since Gradle 6.0.
  boolean isDeprecatedForResolving = false
  if (configuration.metaClass.respondsTo(configuration, 'getResolutionAlternatives')) {
- isDeprecatedForResolving = configuration.getResolutionAlternatives() != null
+ isDeprecatedForResolving = configuration.getResolutionAlternatives()
  }
 
  return canBeResolved && !isDeprecatedForResolving