TOF: Refine parameter getter methods with error handling

[njacazio]

Updated getter functions to specify return types and added error logging for missing parameters.

[github-actions]

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[njacazio]

Thanks to the report of @vkucera

[alibuild]

Error while checking build/O2/fullCI_slc9 for 5022b2a at 2025-12-16 03:53:

## sw/BUILD/O2-sim-challenge-test-latest/log
./grp.log[FATAL] TGrid::Connect returned nullptr. May be due to missing alien token
./sim-challenge.log[FATAL] TGrid::Connect returned nullptr. May be due to missing alien token


## sw/BUILD/o2checkcode-latest/log
--
========== List of errors found ==========
++ GRERR=0
++ grep -v clang-diagnostic-error error-log.txt
++ grep ' error:'
++ GRERR=1
++ [[ 1 == 0 ]]
++ mkdir -p /sw/INSTALLROOT/98ed69c7a634e74fa4d9f1f8726a9b80d1952eab/slc9_x86-64/o2checkcode/1.0-local84/etc/modulefiles
++ cat
--

Full log here.

[github-actions]

This PR did not have any update in the last 30 days. Is it still needed? Unless further action in will be closed in 5 days.

[vkucera]

@noferini Can you have a look, please?