Update redis_reporter.py

we should log share before add block,under certain circumstance i met in test where the first share submitted was just the correct share to solve the block
![clipboard](https://cloud.githubusercontent.com/assets/5118170/4860294/e255c714-60f5-11e4-9ff9-a72a4701329d.png)

as this picture shows there is no chain_{id}_shares in block