Handle original query for URLs without ? character

[chris-jamieson]

When using originalQuery: true option, if the URL does not have a ? character, the regex /^.+\?/ causes the entire request URL to be set as the search parameter. This change checks for the presence of a ? character in the string, and sets an empty string as the search parameter if not present.

At present, the query logic does not account for URLs without a ? character.

For example, a request with URL http://example.com/foo with option originalQuery: true would be transformed to https://my-proxy-destination.com/bar?http://example.com/foo, while http://example.com/foo?id=4 would correctly be transformed to `https://my-proxy-destination.com/bar?id=4

The correct behaviour for URLs without a query string (and therefore no ? character) is that no query should be set to the proxy URL.

[coveralls]

Pull Request Test Coverage Report for Build 90

• 2 of 3 (66.67%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.4%) to 87.931%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
lib/request-options.js	2	3	66.67%
<!--	Total:	2	3	66.67%	-->

Totals
Change from base Build 85:	-0.4%
Covered Lines:	169
Relevant Lines:	183

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💛 - Coveralls