Fix type of data from existing channel

@@ -278,6 +278,10 @@ int main(int argc, char** argv){
         if (keys_nb==-1)  keys_nb=channel_info.total_length;
         else if (keys_nb!=channel_info.total_length) EXIT_ON_CHANNEL_ERROR(&channel_info, "number of keys(%d) differ from channel length (%d)", keys_nb, channel.total_length);
     }
+    else {
+        if (type_str) type=STRING_TO_UINT32(type_str);
+        else type='UIN8'; //default type
+    }
     
     if (key_list==NULL) {
         if (keys_nb==-1){
@@ -297,10 +301,7 @@ int main(int argc, char** argv){
         }
     }
     
-    if (type_str) type=STRING_TO_UINT32(type_str);
-    else type='UIN8'; //default type
-    
-
+