aspectran / aspectran / #5152

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fix(utils/apon): prevent unassigned array parameters from being emitted as empty arrays

Updated `AponWriter` to check if an array-type parameter has been explicitly
assigned a value before serialization. Previously, unassigned array parameters
(like `methods` and `headers` in `JoinpointParameters`) were incorrectly
emitted as empty arrays `[]` because they were internally initialized with
empty lists during the `arraylize()` process.

Key changes:
- Modified `AponWriter.writeParameters` to incorporate `parameter.isAssigned()`
  checks for all array-type parameters (PARAMETERS, TEXT, and general types).
- Added unit tests in `AponWriterTest` to verify that unassigned array
  parameters are omitted (or written as null) while explicitly assigned
  empty arrays are correctly preserved as `[]`.

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