Make API more robust to errors

[DocSavage]

When an incorrectly formatted API call is given, e.g., a 2d size is given for a 3d request, the server has an error and recovers incompletely, not fulfilling later requests even though the system mostly stays up.

Example:

GET "/api/node/bf1/bodies/raw/0_1_2/749_617/2714_3292_2440"

The size is 2d and causes panic on conversion to 3d point.