Fix HTTP Action API `&return=` crashing (ArrayIndexOutOfBoundsException) for a property with parameters

[CrushBy]

Description

Follow-up to #1687. After that fix a single return=<property> query
parameter works for a 0-arity property, but still fails with an
HTTP 500 (internal ArrayIndexOutOfBoundsException) when the named
property takes one or more parameters. The property is read with no
arguments and the read path indexes into an empty argument array instead
of either reading it with NULL arguments or reporting a clear error.

The rule is purely arity-based — 0-arity returns the value, anything with
parameters crashes:

# 0-arity property -> 200, value in the body
POST /eval/action?return=currentUser        -> 200   body: 215

# property with parameters -> HTTP 500 (ArrayIndexOutOfBoundsException)
POST /eval/action?return=idTask             -> 500   # idTask(Task)
POST /eval/action?return=responsible        -> 500   # responsible(Task)

(devmode, no Authorization header; the script body is a harmless
no-op such as MESSAGE 'x';. Reproduced on both /eval and
/eval/action, query-string return= only — a return field in a POST
body is ignored, per #1687. Any property declared with parameters
reproduces it, including built-in ones.)

Expected

Read the property with NULL/empty arguments and return that, or fail
with a clear, actionable error — the way the neighbouring cases already
do — instead of an opaque ArrayIndexOutOfBoundsException:

return=                  -> CompoundNameUtils$ParseException: name '' contains forbidden symbols
return=doesNotExist      -> RuntimeException: Return property doesNotExist was not found
return=name (overloaded) -> AmbiguousElementException: Ambiguous element 'name' was found in modules: ...

Stack trace

java.lang.ArrayIndexOutOfBoundsException: Index 0 out of bounds for length 0
    at lsfusion.server.language.property.oraction.LAP.lambda$0(LAP.java:45)
    at lsfusion.base.col.implementations.simple.SingletonSet.mapOrderValues(SingletonSet.java:330)
    at lsfusion.server.language.property.oraction.LAP.getMap(LAP.java:45)
    at lsfusion.server.language.property.oraction.LAP.getMapValues(LAP.java:37)
    at lsfusion.server.language.property.LP.read(LP.java:98)
    at lsfusion.server.language.property.LP.read(LP.java:110)
    at lsfusion.server.physics.admin.authentication.controller.remote.RemoteConnection.readResult(RemoteConnection.java:744)
    at lsfusion.server.physics.admin.authentication.controller.remote.RemoteConnection.executeExternal(RemoteConnection.java:588)

Environment

• 7.0-SNAPSHOT, server jar from download.lsfusion.org dated 2026-06-17
  (the one carrying the Fix HTTP Action API &return= query parameter crashing with a single property name #1687 fix). The internal version label still
  reports 7.0-SNAPSHOT (388) — same as the pre-fix jar, so the build
  number did not bump.