Fix database opening if original file doesn't exist

Classes/LinphoneManager.m

@@ -234,6 +234,10 @@ struct codec_name_pref_table codec_pref_table[]={
     if ([fileManager fileExistsAtPath:databaseDocumentPath] == NO) {
         [LinphoneLogger logc:LinphoneLoggerLog format:"Create sqlite3 database"];
         NSString *resourceDocumentPath = [[NSBundle mainBundle] pathForResource:@"database" ofType:@"sqlite"];
+        if ([fileManager fileExistsAtPath:resourceDocumentPath] == NO) {
+            [LinphoneLogger log:LinphoneLoggerError format:@"Can't find original database: %@", [error localizedDescription]];
+            return;
+        }
         [fileManager copyItemAtPath:resourceDocumentPath toPath:databaseDocumentPath error:&error];
         if(error != nil) {
             [LinphoneLogger log:LinphoneLoggerError format:@"Can't copy database: %@", [error localizedDescription]];

Classes/LinphoneUI/UICompositeViewController.m

@@ -245,6 +245,7 @@
 }
 
 - (void)didReceiveMemoryWarning {
+    [super didReceiveMemoryWarning];
     [self clearCache];
 }
 

Classes/PhoneMainView.h

@@ -43,7 +43,6 @@
     @private
     UICompositeViewController *mainViewController;
 
-    UIActionSheet *incomingCallActionSheet;
     UIActionSheet *batteryActionSheet;
     
     int loadCount;