Don't crash on invalid fields for /me

We need to see how to better handle it.

app/src/main/java/chat/rocket/android/profile/presentation/ProfilePresenter.kt

@@ -28,8 +28,13 @@ class ProfilePresenter @Inject constructor(private val view: ProfileView,
             view.showLoading()
             try {
                 val myself = retryIO("me") { client.me() }
-                myselfId = myself.id!!
-                val avatarUrl = serverUrl.avatarUrl(myself.username!!)
+                val id = myself.id
+                val username = myself.username
+                if (id == null || username == null) {
+                    view.showGenericErrorMessage()
+                } else {
+                    myselfId = id
+                    val avatarUrl = serverUrl.avatarUrl(username)
                     val email = myself.emails?.getOrNull(0)?.address
                     view.showProfile(
                             avatarUrl,
@@ -37,6 +42,7 @@ class ProfilePresenter @Inject constructor(private val view: ProfileView,
                             myself.username ?: "",
                             email
                     )
+                }
             } catch (exception: RocketChatException) {
                 view.showMessage(exception)
             } finally {