consider importability in exit code

pipelines/build.sh

@@ -47,17 +47,21 @@ echo "===================== importability ====================="
 echo " > try 'from $JOB_NAME.top_level_interface import *'"
 python -c "from $JOB_NAME.top_level_interface import *"
 if [ "$?" != 0 ]; then
+  import_status=$?
   echo "Failed!"
 else
   echo "Done!"
 fi
 
-echo "===================== POST BUILD BELOW ====================="
-
 # the exit value is determined from unit tests
-if [ "$unittest_status" != 0 ]; then
-  exit $unittest_status
+if [ "$unittest_status" != 0 ] || [ "$import_status" != 0 ]; then
+  echo "Test failed!"
+  echo "importability status: $import_status"
+  echo "Unit test status: $unittest_status"
+  echo "===================== POST BUILD BELOW ====================="
+  exit 1
 else
+  echo "===================== POST BUILD BELOW ====================="
   exit 0
 fi