Cannot read property 'wavelength' of undefined on calibration copy

[jywarren]

Please describe your problem in detail, including:

What happened before you saw the error

A contributor tried to copy this spectrum's calibration:

https://spectralworkbench.org/spectrums/92343

to copy over to this spectrum: https://spectralworkbench.org/spectrums/92347

This was done using the "Copy calibration" button, which generates the power tag calibrate:92343#25653 (the #25653 was added to refer to the most recent data snapshot of 92343). This was reproducible simply by entering calibrate:92343#25653 into the tags input (though you have to be an admin to do this unless you fork 92347 and do it on your own fork).

That made a request to:

https://spectralworkbench.org/snapshots/25653.json

But the JavaScript console showed this error:

querying latest snapshot of 92343 for tag.reference_id
application-0add874….js:57 parsing calibrate:92343#25653
application-0add874….js:58 Uncaught TypeError: Cannot read property 'wavelength' of undefined(…)(anonymous function) @ application-0add874….js:58(anonymous function) @ application-0add874….js:58success @ application-0add874….js:57c @ application-0add874….js:24fireWith @ application-0add874….js:24n @ application-0add874….js:26e @ application-0add874….js:26

The use of .wavelength mentioned is most likely on one of these lines:

src/api/SpectralWorkbench.API.Core.js:          line.wavelength = source.json.data.lines[i].wavelength;
src/api/SpectralWorkbench.API.Core.js:      var nmPerPx         = (tempCalibration[tempCalibration.length-1].wavelength - tempCalibration[0].wavelength) / tempCalibration.length,
src/api/SpectralWorkbench.API.Core.js:          startWavelength = tempCalibration[0].wavelength,
src/SpectralWorkbench.Spectrum.js:        if (line.wavelength == null) var x = line.pixel; // change graph labels
src/SpectralWorkbench.Spectrum.js:        else                         var x = line.wavelength;
src/SpectralWorkbench.Spectrum.js:        if (_spectrum.isCalibrated()) lines[lines.length-1].wavelength = _spectrum.average[i].x;
src/SpectralWorkbench.Spectrum.js:        var start =  _spectrum.json.data.lines[0].wavelength;
src/SpectralWorkbench.Spectrum.js:        var end =  _spectrum.json.data.lines[_spectrum.json.data.lines.length-1].wavelength;
src/SpectralWorkbench.Spectrum.js:            w1 = lines[0].wavelength,
src/SpectralWorkbench.Spectrum.js:            w2 = lines[lines.length-1].wavelength,
src/SpectralWorkbench.Spectrum.js:            w1 = lines[0].wavelength,
src/SpectralWorkbench.Spectrum.js:            w2 = lines[lines.length-1].wavelength,
src/SpectralWorkbench.Spectrum.js:        if (keepCalibrated) lines[lines.length - 1].wavelength = _spectrum.pxToNm(index);

What you expected to happen

Browser, version, and operating system

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