anchor.diff:  <% end %>
   
   <h4>Observations</h4>
  -<% unless @observations.empty? %>
  +<% unless @observations.nil? || @observations.empty? %>
     <table class="table table-condensed table-striped observations">
       <tr>
         <th>Type</th>
  
positive.code: <% end %>
  
  <h4>Medications</h4>
  <% unless @medications.empty? %>
    <table class="table table-condensed table-striped medications">
      <tr>
        <th>Type</th>
  
negative.code: <% end %>
  
  <h4>Encounters</h4>
  <% unless @encounters.nil? || @encounters.empty? %>
    <table class="table table-condensed table-striped encounters">
      <tr>
        <th>Type</th>
  