Fix error messages for invalid inputs

[hombit]

Fix #505

[codecov]

Codecov Report

Attention: Patch coverage is 94.11765% with 2 lines in your changes missing coverage. Please review.

Project coverage is 81.80%. Comparing base (6d804da) to head (286d2c3).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
light-curve/src/np_array.rs	94.11%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #510      +/-   ##
==========================================
- Coverage   82.06%   81.80%   -0.27%     
==========================================
  Files           9        9              
  Lines        2570     2577       +7     
==========================================
- Hits         2109     2108       -1     
- Misses        461      469       +8     

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[codspeed-hq]

CodSpeed Performance Report

Merging #510 will degrade performances by 30.17%

_{Comparing fix-casting-exceptions (286d2c3) with master (6d804da)}

Summary

❌ 17 regressions
✅ 87 untouched benchmarks

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
❌	test_benchmark_cesium	12.7 ms	14.8 ms	-13.86%
❌	test_benchmark_cesium	5.3 ms	7.5 ms	-29.23%
❌	test_benchmark_cesium	6.3 ms	8.5 ms	-25.52%
❌	test_benchmark_cesium	5.4 ms	7.5 ms	-28.64%
❌	test_benchmark_cesium	5.3 ms	7.5 ms	-28.91%
❌	test_benchmark_cesium	5.3 ms	7.5 ms	-28.89%
❌	test_benchmark_cesium	5.4 ms	7.5 ms	-28.96%
❌	test_benchmark_cesium	5.2 ms	7.4 ms	-29.66%
❌	test_benchmark_cesium	5 ms	7.2 ms	-30.17%
❌	test_benchmark_cesium	5.1 ms	7.3 ms	-30.11%
❌	test_benchmark_cesium	5.2 ms	7.4 ms	-29.79%
❌	test_benchmark_cesium	5.2 ms	7.4 ms	-29.5%
❌	test_benchmark_cesium	5.3 ms	7.5 ms	-29.02%
❌	test_benchmark_cesium	5.9 ms	8.1 ms	-26.98%
❌	test_benchmark_cesium	5.1 ms	7.3 ms	-29.91%
❌	test_benchmark_cesium	6.9 ms	9 ms	-23.92%
❌	test_benchmark_cesium	5.2 ms	7.3 ms	-29.71%