On system-config-printer we have a bug report about printers with empty MFG field in their device ID not getting assigned a PPD, OpenPrinting/system-config-printer#445. In this bug report such an empty MFG field is observed on some cheaper label printers, according to the poster of the issue.
Blank MFG fields are common on inexpensive thermal label printers.
Real-world example, a Phomemo PM-241-BT (USB ID 2e3c:5750):
MFG: ;CMD:XPP,XL;MDL:PM-241-BT;CLS:PRINTER;DES:PM-241-BT;
Therefore, our fix for issue #214, the pull request #223 with which device IDs with empty MFG just get rejected is not the best solution. We need to consider handling the blank MFG.
On system-config-printer we have a bug report about printers with empty MFG field in their device ID not getting assigned a PPD, OpenPrinting/system-config-printer#445. In this bug report such an empty MFG field is observed on some cheaper label printers, according to the poster of the issue.
Therefore, our fix for issue #214, the pull request #223 with which device IDs with empty MFG just get rejected is not the best solution. We need to consider handling the blank MFG.