Fix for rare cases where pubchem ID has several chembl IDs and thus ligand has several chembl weblinks which gave an error.
Fix for rare cases where pubchem ID has several chembl IDs and thus ligand has several chembl weblinks which gave an error.

fosfataza/protwis,protwis/protwis,fosfataza/protwis,protwis/protwis,cmunk/protwis,fosfataza/protwis,cmunk/protwis,fosfataza/protwis,protwis/protwis,cmunk/protwis,cmunk/protwis