Avoid double "Error:" headers when reporting selector parse errors

nex3 · nex3 · commit c2349cb02a80 · 2019-07-25T08:29:07.000+01:00
diff --git a/spec/libsass-closed-issues/issue_2779.hrx b/spec/libsass-closed-issues/issue_2779.hrx
@@ -5,7 +5,7 @@
 65
 
 <===> error-dart-sass
-Error: $extendee: Error: Parent selectors aren't allowed here.
+Error: $extendee: Parent selectors aren't allowed here.
   ,
 1 | &b
   | ^^

Original file line number	Diff line number	Diff line change
`@@ -5,7 +5,7 @@`
`5`	`5`	`65`
`6`	`6`
`7`	`7`	`<===> error-dart-sass`
`8`		`-Error: $extendee: Error: Parent selectors aren't allowed here.`
	`8`	`+Error: $extendee: Parent selectors aren't allowed here.`
`9`	`9`	`,`
`10`	`10`	`1 \| &b`
`11`	`11`	`\| ^^`