[FIX] Rust: fix unsetting source udp address when not specified by the user

[pszemus]

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source udp address should not be set if not specified by the user

fixes: #1749

[ccextractor-bot]

CCExtractor CI platform finished running the test files on linux. Below is a summary of the test results, when compared to test for commit 1c7e2a0...:

Report Name	Tests Passed
Broken	13/13
CEA-708	14/14
DVB	7/7
DVD	3/3
DVR-MS	2/2
General	27/27
Hardsubx	1/1
Hauppage	3/3
MP4	3/3
NoCC	10/10
Options	86/86
Teletext	21/21
WTV	13/13
XDS	33/34

Your PR breaks these cases:

• ccextractor --autoprogram --out=ttxt --xds --latin1 --ucla e274a73653...

Congratulations: Merging this PR would fix the following tests:

• ccextractor --hardsubx 1a0302f7fd..., Last passed: Never
• ccextractor --datapid 256 c83f765c66..., Last passed: Never

It seems that not all tests were passed completely. This is an indication that the output of some files is not as expected (but might be according to you).

Check the result page for more info.

[ccextractor-bot]

CCExtractor CI platform finished running the test files on windows. Below is a summary of the test results, when compared to test for commit 1c7e2a0...:

Report Name	Tests Passed
Broken	13/13
CEA-708	14/14
DVB	5/7
DVD	3/3
DVR-MS	2/2
General	27/27
Hardsubx	1/1
Hauppage	3/3
MP4	3/3
NoCC	10/10
Options	86/86
Teletext	7/21
WTV	13/13
XDS	34/34

Your PR breaks these cases:

• ccextractor --autoprogram --out=srt --latin1 f1422b8bfe...
• ccextractor --datapid 5603 --autoprogram --out=srt --latin1 --teletext 85c7fc1ad7...
• ccextractor --autoprogram --out=ttxt --latin1 c0d2fba8c0...
• ccextractor --autoprogram --out=ttxt --latin1 006fdc391a...
• ccextractor --autoprogram --out=ttxt --latin1 e92a1d4d2a...
• ccextractor --autoprogram --out=ttxt --latin1 7e4ebf7fd7...
• ccextractor --autoprogram --out=ttxt --latin1 9256a60e4b...
• ccextractor --autoprogram --out=ttxt --latin1 27d7a43dd6...
• ccextractor --autoprogram --out=ttxt --latin1 297a44921a...
• ccextractor --autoprogram --out=ttxt --latin1 efbe129086...
• ccextractor --autoprogram --out=ttxt --latin1 eae0077731...
• ccextractor --autoprogram --out=ttxt --latin1 e2e2b501e0...
• ccextractor --autoprogram --out=ttxt --latin1 c6407fb294...
• ccextractor --autoprogram --out=ttxt --latin1 --datets dcada745de...
• ccextractor --autoprogram --out=srt --latin1 --tpage 398 5d5838bde9...
• ccextractor --autoprogram --out=srt --latin1 --teletext --tpage 398 3b276ad8bf...

Congratulations: Merging this PR would fix the following tests:

• ccextractor --hardsubx 1a0302f7fd..., Last passed: Never
• ccextractor --autoprogram --out=ttxt --xds --latin1 --ucla e274a73653..., Last passed: Never

It seems that not all tests were passed completely. This is an indication that the output of some files is not as expected (but might be according to you).

Check the result page for more info.