Bugfix. Avoid passing null table name input to translation util

[shounakmk219]

This PR fixes the bug introduced in #12417 which blocked /tasks/schedule API with no table name input

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 5 lines in your changes are missing coverage. Please review.

Project coverage is 61.48%. Comparing base (59551e4) to head (e78b172).
Report is 174 commits behind head on master.

Files	Patch %	Lines
...roller/api/resources/PinotTaskRestletResource.java	0.00%	5 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #12726      +/-   ##
============================================
- Coverage     61.75%   61.48%   -0.28%     
+ Complexity      207      198       -9     
============================================
  Files          2436     2460      +24     
  Lines        133233   134601    +1368     
  Branches      20636    20838     +202     
============================================
+ Hits          82274    82753     +479     
- Misses        44911    45664     +753     
- Partials       6048     6184     +136     

Flag	Coverage Δ
custom-integration1	<0.01% <0.00%> (-0.01%)	⬇️
integration	<0.01% <0.00%> (-0.01%)	⬇️
integration1	<0.01% <0.00%> (-0.01%)	⬇️
integration2	0.00% <0.00%> (ø)
java-11	61.47% <0.00%> (-0.24%)	⬇️
java-21	27.91% <0.00%> (-33.71%)	⬇️
skip-bytebuffers-false	61.48% <0.00%> (-0.27%)	⬇️
skip-bytebuffers-true	0.00% <0.00%> (-27.73%)	⬇️
temurin	61.48% <0.00%> (-0.28%)	⬇️
unittests	61.47% <0.00%> (-0.28%)	⬇️
unittests1	46.07% <ø> (-0.82%)	⬇️
unittests2	27.92% <0.00%> (+0.19%)	⬆️

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