Fix appendix headers when missing par

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\section{SECOND APPENDIX}

\label{sec:secondapp}

If each appendix contains similarly formatted text as the body of the document

(i.e., first-order headings) then flysheets are not necessary. If first-order

headings cannot be used, such as with computer data or forms, a flysheet should

  \stepcounter{page}%

  % Add a blank page after the title

  \cleardoublepage

  % Insert the appendix name at the top, with no number

  {\hfill\bf\appendixname~\thesection.\hspace{.5em}\MakeUppercase{#1}\hfill\null}

  % Insert the appendix name at the top, with no number, and centered

  \centerline{\bf\appendixname~\thesection.\hspace{.5em}\MakeUppercase{#1}}%

}

\renewcommand\appendixname{APPENDIX}