[FIX] Disallow empty sharing (#1664)

app/containers/MessageActions.js

@@ -262,6 +262,9 @@ class MessageActions extends React.Component {
 	handleShare = async() => {
 		const { message } = this.props;
 		const permalink = await this.getPermalink(message);
+		if (!permalink) {
+			return;
+		}
 		Share.share({
 			message: permalink
 		});

app/views/InviteUsersView/index.js

@@ -52,7 +52,7 @@ class InviteUsersView extends React.Component {
 
 	share = () => {
 		const { invite } = this.props;
-		if (!invite) {
+		if (!invite || !invite.url) {
 			return;
 		}
 		Share.share({ message: invite.url });

app/views/RoomActionsView/index.js

@@ -389,6 +389,9 @@ class RoomActionsView extends React.Component {
 	handleShare = () => {
 		const { room } = this.state;
 		const permalink = RocketChat.getPermalinkChannel(room);
+		if (!permalink) {
+			return;
+		}
 		Share.share({
 			message: permalink
 		});