fix: display correct information in error statement

[timmahrt]

Fix for #56

Before this PR:

• the incorrect interval was included in the error message for an unhandled exception

After this PR:

• the correct interval is included in the error message

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (8069e3d) 77.21% compared to head (ec64aa6) 77.21%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #57   +/-   ##
=======================================
  Coverage   77.21%   77.21%           
=======================================
  Files          21       21           
  Lines        2638     2638           
=======================================
  Hits         2037     2037           
  Misses        601      601           

Impacted Files	Coverage Δ
praatio/data_classes/interval_tier.py	98.77% <ø> (ø)

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