Fix a registrar conflict error
Fix a registrar conflict error

Fix registrar conflict that can occur if prospector Stat fails.
Fixes #112
dixitk13/log-courier,MichaelLiZhou/log-courier,scrapinghub/log-courier,dixitk13/log-courier,scrapinghub/log-courier,linearregression/log-courier,srizzling/log-courier,dixitk13/log-courier,linearregression/log-courier,srizzling/log-courier,MichaelLiZhou/log-courier,scrapinghub/log-courier,linearregression/log-courier,srizzling/log-courier,MichaelLiZhou/log-courier