fix: mp_abort cleanup

tests/base/mp_abort.test.1.sas

@@ -0,0 +1,28 @@
+/**
+  @file
+  @brief Testing mp_abort macro
+  @details This is an unfixed problem with mp_abort.  When called from within
+  a macro, within a %include, and that macro contains subsequent logic, the
+  service does not end cleanly - rather, we see:
+
+      ERROR: %EVAL function has no expression to evaluate, or %IF statement has no condition.
+      ERROR: The macro TEST will stop executing.
+
+  <h4> SAS Macros </h4>
+  @li mp_abort.sas
+
+**/
+
+%macro test();
+
+filename blah temp;
+data _null_;
+  file blah;
+  put '%mp_abort();';
+run;
+%inc blah;
+
+%if 1=1 %then %put Houston - we have a problem here;
+%mend test;
+
+%test()