[W|0.6.532] Colonist researches in random location when research bench blocked.

[paulme]

Version Found: 0.6.532

Title - Colonist researches in random location when research bench blocked.

Summary - Noticed that colonist were researching in strange places.  Looks to be due to the bench's' person location being blocked by a tree.

Steps to Reproduce -
1. Build bench where the person location is blocked by a tree.
2. Schedule a research project.
3. Watch colonist research where ever they are when gets decided that research is their job.

Expected Results - Shouldn't be able to build bench where tree blocks access, and if it is, colonists should not be able to research.

Actual Results - Colonists research when bench is block anywhere they are standing.