Prevent crashes if contact is null

app/src/main/java/org/linphone/chat/GroupInfoAdapter.java

@@ -60,7 +60,7 @@ class GroupInfoAdapter extends RecyclerView.Adapter<GroupInfoViewHolder> {
         LinphoneContact c = ca.getContact();
 
         holder.name.setText(
-                (c.getFullName() != null)
+                (c != null && c.getFullName() != null)
                         ? c.getFullName()
                         : (ca.getDisplayName() != null) ? ca.getDisplayName() : ca.getUsername());
 

app/src/main/java/org/linphone/contacts/ContactAddress.java

@@ -78,11 +78,14 @@ public class ContactAddress implements Serializable {
     }
 
     public Address getAddress() {
-        String presence =
-                mContact.getContactFromPresenceModelForUriOrTel(
-                        (mPhoneNumber != null && !mPhoneNumber.isEmpty())
-                                ? mPhoneNumber
-                                : mAddress);
+        String presence = null;
+        if (mContact != null) {
+            presence =
+                    mContact.getContactFromPresenceModelForUriOrTel(
+                            (mPhoneNumber != null && !mPhoneNumber.isEmpty())
+                                    ? mPhoneNumber
+                                    : mAddress);
+        }
         Address addr = Factory.instance().createAddress(presence != null ? presence : mAddress);
         // Remove the user=phone URI param if existing, it will break everything otherwise
         if (addr.hasUriParam("user")) {