Indirection can cause crash when syntax of field name is incorrect

Summary:
Uniface: When an indirection of (e.g.) @Field is used to access the content of
a field then this can cause a crash in case the syntax of the field name in
Field is incorrect.

Symptoms:
When an indirection of (e.g.) @Field is used to access the content of a field
then this can cause a crash in case the syntax of the field name in Field is
incorrect.

Consider the following scenario:

• Field = "%%$fieldname%%%.%%$entname%%%"

> $fieldname = "", since there's no current field; $entname = "ENT1"
> Value of Field is ".ENT1"

• Field2 = @Field

> A crash will occur