Remove extra log about error encoding tag

[nmuesch]

What does this PR do?

_to_bytes is logging a message when it can't encode. However, the calling function of _to_bytes has more context and prints a more useful message.

Motivation

No need to log multiple times for the same error.

Review checklist

• PR has a meaningful title or PR has the no-changelog label attached
• Feature or bugfix has tests
• Git history is clean
• If PR impacts documentation, docs team has been notified or an issue has been opened on the documentation repo
• If PR adds a configuration option, it has been added to the configuration file.

Additional Notes

Anything else we should know when reviewing?

[codecov-io]

Codecov Report

Merging #2976 into master will decrease coverage by 9.45%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2976      +/-   ##
==========================================
- Coverage   84.91%   75.45%   -9.46%     
==========================================
  Files         656       46     -610     
  Lines       36072     3573   -32499     
  Branches     4276      427    -3849     
==========================================
- Hits        30629     2696   -27933     
+ Misses       4188      768    -3420     
+ Partials     1255      109    -1146