corrupted MANIFEST

[azazellochg]

Sometimes due to network/download issues the MANIFESt file gets corrupted and either become empty or contain one single line of all files:

temp.txtinput/DefaultFamily_particle_avg.xmpinput/projectionsBacteriorhodopsin.stkinput/commands.cmdinput/discreteAssignment.xmdinput/_tmpPca4input/1o7d.pdbinput/_tmpPca0input/phantomProject.paraminput/Test_Resolution_Big.pnginput/xray_psf_with_volume.volinput/phantom_descr.descrinput/xraySeries.stkinput/DefaultFamily_pca_model.stkinput/rec_art_noise.volinput/1FFKfull_reconstructed.volinput/ml_tomo.tar.gzinput/uniformProjection.paraminput/volume.spiinput/_tmpPca3input/mD1.docinpu

In this case running a test throws:

Traceback (most recent call last):
File "/net/nfs1/public/EM/Scipion/scipion-dev/scipion-pyworkflow/pyworkflow/apps/pw_sync_data.py", line 422, in <module>
main()
File "/net/nfs1/public/EM/Scipion/scipion-dev/scipion-pyworkflow/pyworkflow/apps/pw_sync_data.py", line 98, in main
update(dataset, url=args.url, verbose=args.verbose)
File "/net/nfs1/public/EM/Scipion/scipion-dev/scipion-pyworkflow/pyworkflow/apps/pw_sync_data.py", line 305, in update
md5sLocal = dict(x.strip().split() for x in open(join(datasetFolder, 'MANIFEST')))
ValueError: dictionary update sequence element #0 has length 1; 2 is required

I think we should check if the file contains at least a string with two columns.