fix NPE in ConversationCreationActivity

also avoid not nullable spreedCapabilities elsewhere in this class.

It may not solve the root cause and may lead to unexpected behavior but at least will not crash.

java.lang.NullPointerException
	at com.nextcloud.talk.conversationcreation.ConversationCreationActivityKt.ConversationCreationScreen$lambda$5(ConversationCreationActivity.kt:230)
	at com.nextcloud.talk.conversationcreation.ConversationCreationActivityKt$$ExternalSyntheticLambda29.invoke(D8$$SyntheticClass:0)
	at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke(ComposableLambda.kt:131)
	at androidx.compose.runtime.internal.ComposableLambdaImpl.invoke(ComposableLambda.kt:52)
	at androidx.compose.material3.ScaffoldKt$ScaffoldLayout$bodyContent$1$1.invoke(Scaffold.kt:163)
	at androidx.compose.material3.ScaffoldKt$ScaffoldLayout$bodyContent$1$1.invoke(Scaffold.kt:163)

Signed-off-by: Marcel Hibbe <dev@mhibbe.de>

Author: mahibi

app/src/main/java/com/nextcloud/talk/conversationcreation/ConversationCreationActivity.kt

@@ -244,7 +244,7 @@ fun ConversationCreationScreen(
 
                 if (
                     CapabilitiesUtil.hasSpreedFeatureCapability(
-                        conversationCreationViewModel.currentUser.capabilities?.spreedCapability!!,
+                        conversationCreationViewModel.currentUser.capabilities?.spreedCapability,
                         SpreedFeatures.CONVERSATION_PRESETS
                     )
                 ) {
@@ -362,14 +362,14 @@ fun ConversationNameAndDescription(conversationCreationViewModel: ConversationCr
         onValueChange = {
             if (it.length > CapabilitiesUtil.conversationDescriptionLength(
                     conversationCreationViewModel.currentUser
-                        .capabilities?.spreedCapability!!
+                        .capabilities?.spreedCapability
                 )
             ) {
                 conversationCreationViewModel.updateConversationDescription(
                     it.take(
                         CapabilitiesUtil.conversationDescriptionLength(
                             conversationCreationViewModel.currentUser
-                                .capabilities?.spreedCapability!!
+                                .capabilities?.spreedCapability
                         )
                     )
                 )

app/src/main/java/com/nextcloud/talk/utils/CapabilitiesUtil.kt

@@ -161,8 +161,8 @@ object CapabilitiesUtil {
         return DEFAULT_MAX_GIF_SIZE
     }
 
-    fun conversationDescriptionLength(spreedCapabilities: SpreedCapability): Int {
-        if (spreedCapabilities.config?.containsKey("conversations") == true) {
+    fun conversationDescriptionLength(spreedCapabilities: SpreedCapability?): Int {
+        if (spreedCapabilities?.config?.containsKey("conversations") == true) {
             val map: Map<String, Any>? = spreedCapabilities.config!!["conversations"]
             if (map != null && map.containsKey("description-length")) {
                 return (map["description-length"].toString().toInt())