How to write an applescript and ignore errors

I'm writing an applescript that uses a shell command that will always return an error. Applescript stops as soon as the error occurs. I want the applescript to continue running. How should I tell Applescript to ignore errors?

The basic construct is a try/end try block which runs your own code when an error occurs rather than stopping your script.
An alternative when using do shell script is to suppress stdout and stderr so that errors are not returned to the application. Which you can do by appending ' > /dev/null 2>&1 &' to the end of the shell command.
Note, though, that your command will not work as written because 'choose folder' will return an alias object which can not be passed to a shell command as-is. Shell commands require unix-style paths for all file/folder parameters. Fortunately, AppleScript makes this easy by providing a POSIX path command which will convert an alias to a unix path. Additionally, since Mac paths can commonly include spaces and other non-shell safe characters, you may want to quote the path, too, like:
<pre class=command>set shell_script to "usr/local/bin/readpst -o " & quoted form of POSIX path of mbox_output & " " & pst_input & " > /dev/null 2>&1 &"</pre>

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