Die in case popd fails

src/jat.sh.skel

     # End active phase
     #
     local oldpdir
+    local oldpwd
     oldpdir=$(__jat__sd_keyR P.pdir)
+    oldpwd=$(__jat__sd_keyR P.PWD)
     test -n "$oldpdir" && {
         jat__log_info "changing back from phase dir: $oldpdir"
-        popd >/dev/null
+        popd >/dev/null \
+         || jat__die "failed to go back from phase dir: $oldpdir to $oldpwd"
     }
     __jat__show_pend
     __jat__pdummy