[FIX] throw error when no repetition time was found

[Remi-Gau]

fixes #508

[codecov]

Codecov Report

Merging #509 (1ab3422) into dev (88256d5) will not change coverage.
The diff coverage is 100.00%.

❗ Current head 1ab3422 differs from pull request most recent head 18d57ac. Consider uploading reports for the commit 18d57ac to get more accurate results

@@           Coverage Diff           @@
##              dev     #509   +/-   ##
=======================================
  Coverage   73.05%   73.05%           
=======================================
  Files         192      192           
  Lines        4052     4052           
=======================================
  Hits         2960     2960           
  Misses       1092     1092           

Flag	Coverage Δ
unittests	73.05% <100.00%> (ø)

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Impacted Files	Coverage Δ
src/bids/getAndCheckRepetitionTime.m	100.00% <100.00%> (ø)

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