markers don't seem to work if there is a single marker

[agoode]

I have a "Brother HL-L2370DW series" printer. This library (used by home assistant) doesn't see the toner level from the printer.

When I run the sample code, I get this output:

Printer(info=Info(name='Brother HL-L2370DW series', 
printer_name='Secret', 
printer_uri_supported=['ipp://secret.local/ipp/print', 'ipps://secret.local:443/ipp/print'], 
uptime=2272798, 
command_set='PJL,PCL,PCLXL,URF', 
location='Guest Room', 
manufacturer='Brother', 
model='HL-L2370DW series', 
printer_info='Secret', 
serial=None, 
uuid=None, 
version=['1.72', '3.04'], 
more_info='http://secret.local/net/net/airprint.html'), 
markers=[], 
state=State(printer_state='idle', reasons=None, message=None), 
uris=[Uri(uri='ipp://secret.local/ipp/print', authentication=None, security=None), Uri(uri='ipps://secret.local:443/ipp/print', authentication=None, security=None)])

Using ipptool, these are the marker values:

        marker-colors (nameWithoutLanguage) = #000000
        marker-high-levels (integer) = 100
        marker-levels (integer) = 70
        marker-low-levels (integer) = 9
        marker-names (nameWithoutLanguage) = BK
        marker-types (keyword) = toner

I believe that the library is looking for a list and not working for a single-marker configuration. I would expect to see the markers list populated in the output.

[MattyRoy]

I have encountered the same issue for my Canon MF230 printer - I have created a pull request with changes to cater for this eventually.