global-functions: add $WaitForFile, wait for file on fetch
The fetch command is asynchronous, the file is not guaranteed to be available when command terminates. I opened an issue at Mikrotik support (Ticket#2019041722004999), their answer: > You should perform a check in a loop. > :delay until file exist > > That can happen also with any configuration not just files. So add a function to wait for a file with given name. I have not seen this with other configuration, though.
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