Fix error running package-loading-and-options chunk interactively

[slager]

Fixes #242.

Checklist

• This PR includes unit tests
• This PR establishes a new function or updates parameters in an existing function
  • The roxygen skeleton for this function has been updated using devtools::document
• I have updated NEWS.md to describe the proposed changes

[kelliemac]

looks good to me! @mayerbry since you filed the issue that this is intended to fix, can you please review this PR?

[mayerbry]

thanks Dave!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.05%. Comparing base (4bdaa31) to head (0d0b239).
Report is 4 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #249   +/-   ##
========================================
  Coverage    82.05%   82.05%           
========================================
  Files            8        8           
  Lines          351      351           
========================================
  Hits           288      288           
  Misses          63       63           

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