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Enter:
<{{PAGESIZE:Foo bar}}>
<{{PAGESIZE:Foo_bar}}>
<{{PAGESIZE:Talk:Fartown Ground, Huddersfield}}>

Expected:
<20>
<20>
<559>

Actual:
<>
<>
<>

This can occur either when the top revision is a 'null' revision, noting moves/protections/deletions/etc; or when the top revision is from before the time when rev_len started to be recorded (cf bug12188). The latter is transitory and can be resolved by writing and running the script requested in bug18881; the former needs to be addressed properly.