Minor improvements in sdnexturl.py - #175

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painter1 wants to merge 3 commits into

minor_sdnexturl_improvements

Commits on Mar 19, 2021

- don't crash if tr.url doesn't exist
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Commits on Mar 22, 2021

a change I had forgotten to include: correctly comptue newurl in
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Commits on Mar 24, 2021

Merge in recent master branch changes for sdnexturl.py.
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