Milo: Fix empty lines in step text

milo/appengine/frontend/templates/pages/build.html

 {{define "title"}}
   {{ with .Build.Summary -}}
     {{ if eq .Status.String "InfraFailure" }}
       Exception
     {{ else if eq .Status.String "Failure" }}
       Failed
     {{ else if eq .Status.String "NotRun" }}
       Pending
     {{ else }}
       {{ .Status.String }}
@@ skipping 155 matching lines @@
           {{ end }}
 
           {{ range .Build.Components  }}
           <li class="verbosity-{{.Verbosity.String}}">
             <div class="status-{{.Status}} result">
               <b>{{.Label}}</b>
               {{ if .Duration -}}
                 <span style="float:right">( {{ .Duration | humanDuration }} )</span>
               {{- end }}
               <span>
-                {{ range .Text }}<div class="step-text">{{ . }}</div>{{ end }}
+                {{ range .Text -}}
+                  <div class="step-text">
+                    {{- if . -}}{{- . -}}{{- else -}}&nbsp;{{- end -}}
+                  </div>
+                {{- end }}
               </span>
             </div>
             <ul>
               {{ if .MainLink }}
                 <li>{{.MainLink | linkifySet}}</li>
                 {{- if eq .Verbosity.String "Interesting" -}}
                   {{ range .MainLink }}
                     <link rel="prerender" href="{{.URL}}">
                     <link rel="prefetch" href="{{.URL}}">
                   {{ end }}
@@ skipping 105 matching lines @@
     }
   };
 
   check($("#showHidden").is(":checked"));
   $("#showHidden").click(function(e) {
     check($(this).is(":checked"));
   });
 });
 </script>
 {{end}}