How can we avoid recording empty HTTP requests to object log as errors?

[jgfoster]

We have observed that browsers will open a connection to our web server and then close the connection without sending a request. These get recorded in the object log as an unrecognized method (the empty string is not a GET, not a POST, etc.). We are considering the following:

`ZnUnknownHttpMethod>>signal

^method isEmpty
	ifTrue: [self]	"okay to ignore empty requests"
	ifFalse: [super signal]`