The navigator fails when a move is not possible

[jwaa]

Describe the bug
When an agent is told to move to a waypoint next to it which it cannot move to, it gives an exception. See this line. Instead, it is better to check that there is indeed nothing to do since the agent is already as close as possible and instead of raising an exception do nothing.

E.g. an if statement somewhere such as this:

if current_wp.location == agent_loc:
    route = {agent_loc : None}

The question is... where? Since the route is not empty (the agent is not actually on that location) but it cannot move any closer.

To Reproduce
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Expected behavior
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Screenshots
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Stacktrace
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Additional context
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