homography mapping crash

[ChristophTobler]

the node (or even computer) crashes if the number of cameras is less than the number of homography mappings

[dominiho]

resolved in master (#18)

[ChristophTobler]

still happens, but not crashing. The error I get when my homography mappings looks like that: [[0,1], [2,3], [4,5]] but I just use 2 cameras:

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