fix post quote for null extra texts.

Clover/app/src/main/java/org/floens/chan/core/presenter/ReplyPresenter.java

@@ -299,6 +299,7 @@ public class ReplyPresenter implements AuthenticationLayoutCallback, ImagePickDe
         String postQuote = post != null ? ">>" + post.no + "\n" : "";
 
         StringBuilder textQuoteResult = new StringBuilder();
+        if (textQuote != null) {
             String[] lines = textQuote.split("\n+");
             // matches for >>123, >>123 (OP), >>123 (You), >>>/fit/123
             final Pattern quotePattern = Pattern.compile("^>>(>/[a-z0-9]+/)?\\d+.*$");
@@ -308,6 +309,7 @@ public class ReplyPresenter implements AuthenticationLayoutCallback, ImagePickDe
                     textQuoteResult.append(">").append(line).append("\n");
                 }
             }
+        }
 
         commentInsert(extraNewline + postQuote + textQuoteResult.toString());