Journal sharing: Add a nice error message when journal is not found.

app/src/main/java/com/etesync/syncadapter/ui/AddMemberFragment.java

@@ -82,7 +82,11 @@ public class AddMemberFragment extends DialogFragment {
             try {
                 UserInfoManager userInfoManager = new UserInfoManager(httpClient, remote);
 
-                memberPubKey = userInfoManager.get(memberEmail).getPubkey();
+                UserInfoManager.UserInfo userInfo = userInfoManager.get(memberEmail);
+                if (userInfo == null) {
+                    throw new Exception(getString(R.string.collection_members_error_user_not_found, memberEmail));
+                }
+                memberPubKey = userInfo.getPubkey();
                 return new AddResult(null);
             } catch (Exception e) {
                 return new AddResult(e);

app/src/main/res/values/strings.xml

@@ -119,6 +119,7 @@
     <string name="collection_members_adding">Adding member</string>
     <string name="trust_fingerprint_title">Verify security fingerprint</string>
     <string name="trust_fingerprint_body">Verify %s\'s security fingerprint to ensure the encryption is secure.</string>
+    <string name="collection_members_error_user_not_found">User (%s) not found, or has journal sharing disabled.</string>
     <string name="collection_members_removing">Removing member</string>
     <string name="collection_members_remove_error">Error removing member</string>
     <string name="collection_members_remove_title">Remove member</string>