Don't stop solves with some invalid sub-solves, only skip invalid solves

[david-cattermole]

Problem / Feature

When a solve does not have enough markers on at least one frame, mmSolver will currently stop the entire solve from running, even if only one frame is not working.

I propose we simply skip the invalid solves, rather than stopping all of them. This will simplify solves when multiple markers are turning on/off on many frames.

Expected behavior: When a solve with 100 frames has a single frame solve's validation failed, all other 99 frames should still solve, only skipping the single frame.

Actual behavior: When a solve with 100 frames has a single frame solve's validation failed, mmSolver will not solve any of the frames.

Software Versions

• mmSolver version: v0.3.x
• Maya version: All
• Operating System (OS): All

[david-cattermole]

This will be released in v0.3.9.