Avoid ArrayIndexOutOfBoundsException with no args (#9393)

The `null` check creates a new Array but always assumed a non-empty one which may lead to
```
java.lang.ArrayIndexOutOfBoundsException: Index 0 out of bounds for length 0
at org.enso.runtime/org.enso.interpreter.service.ExecutionService$FunctionPointer.collectNotAppliedArguments(ExecutionService.java:778)
at org.enso.runtime/org.enso.interpreter.instrument.job.ProgramExecutionSupport$.sendExpressionUpdate(ProgramExecutionSupport.scala:430)
at org.enso.runtime/org.enso.interpreter.instrument.job.ProgramExecutionSupport$.$anonfun$executeProgram$3(ProgramExecutionSupport.scala:81)
at org.enso.runtime/org.enso.interpreter.service.ExecutionCallbacks.callOnComputedCallback(ExecutionCallbacks.java:146)
at
org.enso.runtime/org.enso.interpreter.service.ExecutionCallbacks.updateCachedResult(ExecutionCallbacks.java:117
...
```
Added a guard to prevent the exception. The flag will be useless anyway as we won't enter the for-loop in this case.

Appears to be introduced via #8743. Discovered while debugging #9389.

engine/runtime-instrument-common/src/main/java/org/enso/interpreter/service/ExecutionService.java

@@ -775,7 +775,7 @@ public static int[] collectNotAppliedArguments(Function function) {
       if (preAppliedArguments == null) {
         preAppliedArguments = new Object[functionSchema.getArgumentsCount()];
       }
-      boolean isStatic = preAppliedArguments[0] instanceof Type;
+      boolean isStatic = preAppliedArguments.length == 0 || preAppliedArguments[0] instanceof Type;
       int selfArgumentPosition = isStatic ? -1 : 0;
       int[] notAppliedArguments = new int[functionSchema.getArgumentsCount()];
       int notAppliedArgumentsLength = 0;