Check for store closed on getting folder

app/src/main/java/eu/faircode/email/Core.java

@@ -144,7 +144,7 @@ class Core {
     private static final long FUTURE_RECEIVED = 30 * 24 * 3600 * 1000L; // milliseconds
     private static final int LOCAL_RETRY_MAX = 2;
     private static final long LOCAL_RETRY_DELAY = 5 * 1000L; // milliseconds
-    private static final int TOTAL_RETRY_MAX = LOCAL_RETRY_MAX * 10;
+    private static final int TOTAL_RETRY_MAX = LOCAL_RETRY_MAX * 5;
 
     static void processOperations(
             Context context,

app/src/main/java/eu/faircode/email/ServiceSynchronize.java

@@ -1326,7 +1326,15 @@ public class ServiceSynchronize extends ServiceBase implements SharedPreferences
 
                                                                     db.folder().setFolderState(folder.id, "connecting");
 
-                                                                    ifolder = iservice.getStore().getFolder(folder.name);
+                                                                    try {
+                                                                        ifolder = iservice.getStore().getFolder(folder.name);
+                                                                    } catch (IllegalStateException ex) {
+                                                                        if ("Not connected".equals(ex.getMessage()))
+                                                                            return; // Store closed
+                                                                        else
+                                                                            throw ex;
+                                                                    }
+
                                                                     try {
                                                                         ifolder.open(Folder.READ_WRITE);
                                                                         if (ifolder instanceof IMAPFolder)