Merge branch 'ab/pager-exit-log'

When a pager spawned by us exited, the trace log did not record its exit status correctly, which has been corrected. * ab/pager-exit-log: pager: properly log pager exit code when signalled run-command: add braces for "if" block in wait_or_whine() pager: test for exit code with and without SIGPIPE pager: refactor wait_for_pager() function