Fix execute_bazel_run() to no longer miss targets. (#523)
Fix execute_bazel_run() to no longer miss targets. (#523)

The old code only passed the target to Bazel when incompatible flags were used (due to operator precedence).
Without flags (or in --migrate mode), bazelci failed with "Must specify a target to run".
bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration