Out of bounds error in IntegratePeaksShoeboxTOF

[RichardWaiteSTFC]

Describe the bug

Error in execution of algorithm IntegratePeaksShoeboxTOF:
index 0 is out of bounds for axis 0 with size 0
  at line 434 in '/mnt/ceph/home/rw1061637/.conda/envs/mantid-unstable/plugins/python/algorithms/IntegratePeaksShoeboxTOF.py'

To Reproduce
Found integrating predicted peaks in run SXD34361
(1) Ask me for .nxs files of workspace and peaks
(2) Run this script

ws = Load(Filename='SXD34361_processed.nxs', OutputWorkspace='SXD34361')
peaks = Load(Filename='SXD34361_peaks.nxs', OutputWorkspace='SXD34361 _peaks')

params = {"NRows": 7, "NCols": 7, "GetNBinsFromBackToBackParams": True, 
          "NFWHM": 3, "NShoeboxInWindow": 3, 
          "WeakPeakThreshold": 20, 
          "WeakPeakStrategy": "NearestStrongPeak",
          "IntegrateIfOnEdge": False, "LorentzCorrection": True}
          
peaks_int = IntegratePeaksShoeboxTOF(InputWorkspace=ws, PeaksWorkspace=peaks, OutputWorkspace='peaks_int', **params)

Expected behavior
Would not crash - the problem seems to be here

mantid/Framework/PythonInterface/plugins/algorithms/IntegratePeaksShoeboxTOF.py

Line 434 in 84edbc4

ipos = [*np.argwhere(ispecs == weak_pk.ispec)[0], np.argmin(abs(x - weak_pk.tof))]

It looks like weak_pk.ispec is not in ispecs perhaps because the shoebox has been moved/optimised?

Screenshots

Platform/Version (please complete the following information):

• OS: [e.g. Windows, RHEL 7, Ubuntu, macOS]
• OS Version:
• Mantid Version [e.g. 6.0.0]

Additional context