Changes
don't add base notation if the input was non-numeric
{{#invoke: BaseConvert
| convert
| n={{{1|0}}}
| base=16
| precision=0
| width={{#switch:{{{2}}}|no|none=2|#default=0}}
| suffix={{#switch:{{{2}}}|no|none|digit=|hex=<sub>hex</sub>|#default=<sub>16</sub>}}
}}<noinclude>
{{documentation}}
</noinclude>
| convert
| n={{{1|0}}}
| base=16
| precision=0
| width={{#switch:{{{2}}}|no|none=2|#default=0}}
| suffix={{#switch:{{{2}}}|no|none|digit=|hex=<sub>hex</sub>|#default=<sub>16</sub>}}
}}<noinclude>
{{documentation}}
</noinclude>