Fatal error on updating display machine name, when blocks module is not installed

Actually i think that the block display might not appear at all if there is no block module installed, though this might cause a lot of additional problems if we do that.

Lets go with this patch, thanks for writing one! Just added a comment + proper indentation.

Thanks for the patch! Committed it to 7.x-3.x and 8.x-3.x

You better use db_table_exists() because module could be installed but disabled

Feel free to post a follow-up patch.

Suppose code comment is ok, just need to check block's table.
module_exists() returns TRUE only if module installed and enabled

I'm not sure, but why would you want to update the block table if you don't have the block module installed ...
At least in most cases you expect that the table data is not changed anymore once you have disabled a module.

After some dicussions i realized you were right! Committed to both 7.x-3.x and 8.x-3.x

We need this because of block module could be installed but disabled