anchor.diff:  
           <% else %>
             \vspace{1 mm}
  -          <%= latex_safe sheet_variable.get_response(@sheet.project.show_type) %>
  +          <%= latex_safe(sheet_variable.get_response(@sheet.project.show_type)) if sheet_variable %>
             \vspace{2 mm}
           <% end %>
         <% elsif variable.variable_type == 'signature' %>
  
positive.code:       \begin{addmargin}[0em]{0em}\textbf{<%= latex_safe variable.display_name %>}\end{addmargin}
  
        <% if variable.variable_type == 'checkbox' %>
          <% if sheet_variable.get_response(@sheet.project.show_type).size == 0 %>
            \vspace{1 mm}
            \textcolor[gray]{0.5}{Unknown}
            \vspace{2 mm}
  
negative.code:           \textcolor[gray]{0.5}{No Signature}
            \vspace{2 mm}
          <% end %>
        <% elsif !sheet_variable or (sheet_variable and sheet_variable.get_response(@sheet.project.show_type).blank?) %>
          \vspace{1 mm}
          \textcolor[gray]{0.5}{Unknown}
          \vspace{2 mm}
        <% else %>
          \vspace{1 mm}
          <%= latex_safe(sheet_variable.get_response(@sheet.project.show_type)) if sheet_variable %>
          \vspace{2 mm}
        <% end %>
  
  