fix blank replacement on relabel matches fixes #363

[crystalstorm]

This will fix the relabeling issues reported here #363 and here #377

if len(r.Matches) > 0 {
	replacement := ""
	for i := range r.Matches {
		if r.Matches[i].CompiledRegexp.MatchString(sourceValue) {
			replacement = r.Matches[i].CompiledRegexp.ReplaceAllString(sourceValue, r.Matches[i].Replacement)
			break
		}
	}
	sourceValue = replacement
}

The current logic is flawed, because in the case where there are Matches but the Regexp does NOT match the sourceValue
the sourceValue still gets replaced with ""

[codeclimate]

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