added tokenizer test for empty quotes

config/testdata/quotes-empty.tok

@@ -0,0 +1,3 @@
+one "" three
+"" five ""
+seven

config/tokenizer.go

@@ -131,9 +131,7 @@ func (t *Tokenizer) Scan() bool {
 
 end:
 	if t.err == nil || t.err == io.EOF {
-		if b.Len() > 0 {
-			t.text = b.String()
-		}
+		t.text = b.String()
 	}
 	return t.err == nil
 }

config/tokenizer_test.go

@@ -29,6 +29,12 @@ func TestQuotesMultiline(t *testing.T) {
 	)
 }
 
+func TestQuotesEmpty(t *testing.T) {
+	runTest(t, "quotes-empty",
+		`[["one","","three"],["","five",""],["seven"]]`,
+	)
+}
+
 func TestComments(t *testing.T) {
 	runTest(t, "comments",
 		`[[],["one"],[],["two"],[],["three"]]`,