Do not save performance test results if worktree is dirty

The test driver will automatically save performance results to git notes. Notes are attached to commits, but if the working tree is dirty, performance characteristics my be affected and the saved results will not be valid.

• Only save performance test results if work tree is dirty.
• Bonus: don't save to a git note if we have 0 results.
• Update wiki page.

Trac metadata

Trac field	Value
Version	8.6.2
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Test Suite
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture

changed milestone to %8.6.3

changed weight to 5

added Tbug Trac import testsuite + 1 deleted label

assigned to @trac-davide

changed title from Do not save performance test results if work tree is dirty to Do not save performance test results if worktree is dirty

Trac metadata

Trac field	Value
Differential revisions	- → D5368

Are we currently generating these notes in the committer's system? What happens if I commit without running perf tests? What happens if my computer is too slow or fast and generates deviated numbers?

Ticket retargeted after milestone closed

mentioned in commit 54ee148c

closed

changed milestone to %8.8.1

Trac metadata

Trac field	Value
Resolution	Unresolved → ResolvedFixed

added infrastructure label

added Pnormal label