fix defline when method start is unknown

[KristofferC]

183c5b4#r67187294

[codecov-commenter]

Codecov Report

Merging #307 (47c3d18) into master (1102fb8) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #307   +/-   ##
=======================================
  Coverage   51.08%   51.08%           
=======================================
  Files           9        9           
  Lines         826      826           
=======================================
  Hits          422      422           
  Misses        404      404           

Impacted Files	Coverage Δ
src/locationinfo.jl	75.36% <100.00%> (ø)

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