Units don't move when you click an unpassable tile

[wzdev-ci]

type_bug | by NoQ

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Situation: you order your units to move to an unpassable tile
Current behavior: units don't move at all
Wanted behavior: units go to the nearest (pathfinder-wise) passable tile adjacent to the target (not really precise description, but other games do that).

See also http://forums.wz2100.net/viewtopic.php?f=30&t=8136&p=83794#p83793

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Issue migrated from trac:2803 at 2022-04-16 08:27:36 -0700

[wzdev-ci]

Per commented

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There are two separate problems here:

• There is sanity checking to see if pathfinding can go to a continent before trying to resolve it. We may have to change this back again.
• If there is a building at the target location that you cannot see, an effort to go there will fail. This is a problem with the targeting code, and should be fixed.