Evaluates an expression and conditionally generates the text.
Object is any macro name. If expansion of object returns empty string, then then-body is returned as the expansion of $IFNOTEMPTY$ macro. Otherwise the else-body is returned if any.
The then-body and else-body is any text that can appear inside macro body, which means also another macro call. Thus, $IFNOTEMPTY$ macro may be nested.
The full name of member is $MEMBER-NAME$.
The full name of member is $MEMBER-NAME$ ($MEMBER-MODULE$).
See read-only macros.