there are two locations where the line is not continuous.
I usually just double-click on the line, select a node, hit the home or end key and zoom in a little. Then move one node a tad away, move it back over the original place and it will connect.
In your case, there are two locations to do that to. However, knowing that there are only two locations, after one of them is fixed, you can again hit the home key and press enter.
Mike
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