Bug report

System info: master on 31-may-2018, MacOS

Steps to reproduce:

1. List measurements in some TSM file containing only one measurement influx_inspect dumptsm -all data/db/autogen/1/000000001-000000001.tsm
2. Delete only measurement from that TSM file influx_inspect deletetsm -measurement "m" data/db/autogen/1/000000001-000000001.tsm
3. List measurements in that TSM file influx_inspect dumptsm -all data/db/autogen/1/000000001-000000001.tsm

Expected behavior:
Measurement does not exist in TSM file, or TSM file is deleted.

Actual behavior:
Measurement still exists. Error message "deletetsm: no values written".

Tested with TSM file containing 4 measurements, deleted oldest-to-newest. Tested again with TSM file containing 3 measurements, deleted newest-to-oldest.