Fix call on null in SocialApiService

[juliushaertl]

Fixes #2348

Gets rid of the magic value 'any' and replaces it with a default null value for the network fallback to take the first matching.

[codecov]

Codecov Report

Merging #2351 (4e4c80a) into master (0041bcd) will decrease coverage by 0.30%.
The diff coverage is 55.55%.

❗ Current head 4e4c80a differs from pull request most recent head 9641980. Consider uploading reports for the commit 9641980 to get more accurate results

@@             Coverage Diff              @@
##             master    #2351      +/-   ##
============================================
- Coverage     69.55%   69.25%   -0.31%     
- Complexity      238      246       +8     
============================================
  Files            22       22              
  Lines           680      696      +16     
============================================
+ Hits            473      482       +9     
- Misses          207      214       +7     

Impacted Files	Coverage Δ
lib/Cron/SocialUpdate.php	0.00% <0.00%> (ø)
lib/Service/Social/DiasporaProvider.php	87.23% <50.00%> (-1.66%)	⬇️
lib/Service/Social/FacebookProvider.php	88.88% <50.00%> (-1.81%)	⬇️
lib/Service/Social/InstagramProvider.php	86.00% <50.00%> (-1.50%)	⬇️
lib/Service/Social/MastodonProvider.php	86.04% <50.00%> (-1.76%)	⬇️
lib/Service/Social/TumblrProvider.php	92.85% <50.00%> (-3.30%)	⬇️
lib/Service/Social/TwitterProvider.php	85.41% <50.00%> (-1.54%)	⬇️
lib/Service/Social/XingProvider.php	85.36% <50.00%> (-1.82%)	⬇️
lib/Service/Social/GravatarProvider.php	100.00% <100.00%> (ø)
lib/Service/SocialApiService.php	91.15% <100.00%> (ø)

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[skjnldsv]

/rebase

[juliushaertl]

@call-me-matt Thanks for the additional commit, applied and seems to work properly now 👍