Minor refactor so that errorTokens that are not commas skip other if conditions.

Author: jwang1919

src/validations/css/prettycss.js

@@ -71,19 +71,20 @@ const errorMap = {
           column: previousLine.length - 1,
         };
       }
-      if (/,(?=\s*,)/.test(thisLine)) {
-        return {
-          reason: 'extra-commas',
-          row: lineNumber - 1,
-          column: errorToken.charNum,
-        };
-      }
-      if (
-        errorToken.content === ',' &&
-        errorToken.charNum - 1 !== /,/.exec(thisLine).index &&
-        endsWith(trim(thisLine), ';')
-      ) {
-        return null;
+      if (errorToken.content === ',') {
+        if (/,(?=\s*,)/.test(thisLine)) {
+          return {
+            reason: 'extra-commas',
+            row: lineNumber - 1,
+            column: errorToken.charNum,
+          };
+        }
+        if (
+          errorToken.charNum - 1 !== /,/.exec(thisLine).index &&
+          endsWith(trim(thisLine), ';')
+        ) {
+          return null;
+        }
       }
     }