Update NotContains match mode for Header and QueryParameters to support missing/empty values

[evmurphy]

fixes #2260

Currently the NotContains modes for both Header and QueryParameter matches do not match correctly when the value of the header/query is empty or if the key does not exist entirely.

Updated the match logic to the below (assuming any non-empty request values match the value specified by the route):

Type	Mode	RequestKey	RequestValue	CurrentMatch	ExpectedMatch
Header/QueryParam	NotContains	None	-	No	Yes
Header/QueryParam	NotContains	Exists	Empty	No	Yes
Header/QueryParam	NotContains	Exists	NonEmpty	No	No

[evmurphy]

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[MihaZupan]

Thanks, I just changed the style a little bit