Fixes a small issue introduced in commit 1691b11370 where pasting in the composer crashes when it doesn't contain a URL (so any other textual paste will crash). The code was intended only for "share" actions, hence why it was expecting a URL enclosed.

app/src/main/java/com/keylesspalace/tusky/util/ParserUtils.java

@@ -40,8 +40,8 @@ public class ParserUtils {
 
             // If we share with an app, it's not only an url
             List<String> strings = StringUtils.extractUrl(pasteData);
-            String url = strings.get(0); // we assume that the first url is the good one
             if (strings.size() > 0) {
+                String url = strings.get(0); // we assume that the first url is the good one
                 if (URLUtil.isValidUrl(url)) {
                     new ThreadHeaderInfo().execute(url);
                 }