Crash fixes

mastodon/src/main/java/org/joinmastodon/android/fragments/BaseStatusListFragment.java

@@ -243,6 +243,8 @@ public abstract class BaseStatusListFragment<T extends DisplayItemsParent> exten
 			}
 
 			private ImageStatusDisplayItem.Holder<?> findPhotoViewHolder(int index){
+				if(list==null)
+					return null;
 				int offset=0;
 				for(StatusDisplayItem item:displayItems){
 					if(item.parentID.equals(parentID)){

mastodon/src/main/java/org/joinmastodon/android/fragments/ThreadFragment.java

@@ -64,7 +64,8 @@ public class ThreadFragment extends StatusListFragment{
 						}
 						result.descendants=filterStatuses(result.descendants);
 						result.ancestors=filterStatuses(result.ancestors);
-						footerProgress.setVisibility(View.GONE);
+						if(footerProgress!=null)
+							footerProgress.setVisibility(View.GONE);
 						data.addAll(result.descendants);
 						int prevCount=displayItems.size();
 						onAppendItems(result.descendants);

mastodon/src/main/java/org/joinmastodon/android/fragments/onboarding/AccountActivationFragment.java

@@ -1,5 +1,6 @@
 package org.joinmastodon.android.fragments.onboarding;
 
+import android.content.ActivityNotFoundException;
 import android.content.Intent;
 import android.content.res.Configuration;
 import android.os.Build;
@@ -110,7 +111,11 @@ public class AccountActivationFragment extends AppKitFragment{
 	}
 
 	private void onButtonClick(){
-		startActivity(Intent.makeMainSelectorActivity(Intent.ACTION_MAIN, Intent.CATEGORY_APP_EMAIL).addFlags(Intent.FLAG_ACTIVITY_NEW_TASK));
+		try{
+			startActivity(Intent.makeMainSelectorActivity(Intent.ACTION_MAIN, Intent.CATEGORY_APP_EMAIL).addFlags(Intent.FLAG_ACTIVITY_NEW_TASK));
+		}catch(ActivityNotFoundException x){
+			Toast.makeText(getActivity(), R.string.no_app_to_handle_action, Toast.LENGTH_SHORT).show();
+		}
 	}
 
 	private void onBackButtonClick(){

mastodon/src/main/java/org/joinmastodon/android/fragments/onboarding/InstanceCatalogFragment.java

@@ -105,6 +105,8 @@ public class InstanceCatalogFragment extends BaseRecyclerFragment<CatalogInstanc
 				.setCallback(new Callback<>(){
 					@Override
 					public void onSuccess(List<CatalogInstance> result){
+						if(getActivity()==null)
+							return;
 						Map<String, List<CatalogInstance>> byLang=result.stream().collect(Collectors.groupingBy(ci->ci.language));
 						for(List<CatalogInstance> group:byLang.values()){
 							Collections.sort(group, (a, b)->{

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

@@ -305,4 +305,5 @@
 	<string name="error_saving_file">Error saving file</string>
 	<string name="file_saved">File saved</string>
 	<string name="downloading">Downloading…</string>
+	<string name="no_app_to_handle_action">There\'s no app to handle this action</string>
 </resources>