fix getPcAnno.TPcids to deal with empty content properly
Needs to deal with no HSDB content for a given CID. Thanks to @jessy.krier for the bug report.
Ref URL: https://pubchem.ncbi.nlm.nih.gov/compound/17748#section=Pharmacology-and-Biochemistry
Needs to deal with no HSDB content for a given CID. Thanks to @jessy.krier for the bug report.
Ref URL: https://pubchem.ncbi.nlm.nih.gov/compound/17748#section=Pharmacology-and-Biochemistry