Scaffold ReplaceOp::copyScaffold() throws an error for empty files

Problem/Motivation

If you scaffold an empty file, (one which exists in the source directory, but has length=0), the scaffold plugin throws an error.

Steps to reproduce

Proposed resolution

ReplaceOp::copyScaffold() says this:

    $success = file_put_contents($destination->fullPath(), $this->contents());
    if (!$success) {
      throw new \RuntimeException($interpolator->interpolate("Could not copy source file <info>[src-rel-path]</info> to <info>[dest-rel-path]</info>!"));
    }

file_put_contents() can return 0 for the length of the written file, or FALSE on failure. Since we're checking for !$success, we generate an error in either case.

Remaining tasks

User interface changes

API changes

Data model changes

Release notes snippet