fix: Fix rare NullPointerException + log it to sentry

This fixes the regression introduced in commit 05a0bd5

Author: LouisCAD

app/src/main/java/com/infomaniak/mail/ui/newMessage/NewMessageViewModel.kt

@@ -105,6 +105,7 @@ import io.realm.kotlin.ext.copyFromRealm
 import io.realm.kotlin.ext.realmListOf
 import io.realm.kotlin.ext.toRealmList
 import io.realm.kotlin.types.RealmList
+import io.sentry.Breadcrumb
 import io.sentry.Sentry
 import kotlinx.coroutines.CompletableJob
 import kotlinx.coroutines.CoroutineDispatcher
@@ -363,8 +364,13 @@ class NewMessageViewModel @Inject constructor(
         val quote = draftInitManager.createQuote(draftMode, fullMessage, draft.attachments)
         if (quote != null) initialQuote = quote
 
+        if (fullMessage.body == null) {
+            SentryLog.e(TAG, "The message we're trying to reply to has an unexpected null body") { scope ->
+                scope.addBreadcrumb(Breadcrumb.info("message resource: ${fullMessage.resource}"))
+            }
+        }
         val isAiEnabled = currentMailbox().featureFlags.contains(FeatureFlag.AI)
-        if (isAiEnabled) parsePreviousMailToAnswerWithAi(fullMessage.body!!)
+        if (isAiEnabled) parsePreviousMailToAnswerWithAi(fullMessage.body)
 
         val isEncryptionEnabled = currentMailbox().featureFlags.contains(FeatureFlag.ENCRYPTION)
         if (isEncryptionEnabled) draft.isEncrypted = fullMessage.isEncrypted
@@ -567,9 +573,9 @@ class NewMessageViewModel @Inject constructor(
         }
     }
 
-    private suspend fun parsePreviousMailToAnswerWithAi(previousMessageBody: Body) {
+    private suspend fun parsePreviousMailToAnswerWithAi(previousMessageBody: Body?) {
         if (draftMode == DraftMode.REPLY || draftMode == DraftMode.REPLY_ALL) {
-            aiSharedData.previousMessageBodyPlainText = previousMessageBody.asPlainText()
+            aiSharedData.previousMessageBodyPlainText = previousMessageBody?.asPlainText()
         }
     }