avoid crashing PCA and LE-LLE views if no data available

ippisite/ippidb/templates/about-le-lle.html

@@ -6,7 +6,7 @@
 {% block pagetitle %}Efficiencies: iPPI-DB biplot LE versus LLE{% endblock%}
 
 {% block view_content %}
-
+{% if le_lle_biplot_data %}
 <div class="row">
 	<div class="col-md-12">
 		<canvas id="le_lle_biplot"></canvas>
@@ -21,4 +21,9 @@
 <script>
 drawCompoundsBiplotChart('le_lle_biplot', preparePerFamilyBiplotData({{ le_lle_biplot_data | safe }}), 'pharmacology', {'legend':{'position':'right'}});
 </script>
+{% else %}
+  <div class="alert alert-danger" role="alert">
+	The LE-LLE data are not currently available
+  </div>
+{% endif %}
 {% endblock %}

ippisite/ippidb/templates/about-pca.html

@@ -5,6 +5,7 @@
 {% block pagetitle %}PHYSICOCHEMISTRY{% endblock%}
 
 {% block view_content %}
+{% if pca_biplot_data %}
 <div class="row">
 	<canvas id="pca_biplot"></canvas>
 </div>
@@ -17,4 +18,9 @@
 <script>
 	drawCompoundsBiplotChart('pca_biplot', preparePerFamilyBiplotData({{ pca_biplot_data | safe }}.data), 'physicochemical', { 'legend': { 'position': 'right' } });
 </script>
+{% else %}
+  <div class="alert alert-danger" role="alert">
+	The PCA data are not currently available
+  </div>
+{% endif %}
 {% endblock %}
\ No newline at end of file

ippisite/ippidb/views/about.py

@@ -149,7 +149,10 @@ def about_pharmacology(request):
 
 
 def about_le_lle(request):
-    context = {"le_lle_biplot_data": LeLleBiplotData.objects.get().le_lle_biplot_data}
+    try:
+        context = {"le_lle_biplot_data": LeLleBiplotData.objects.get().le_lle_biplot_data}
+    except LeLleBiplotData.DoesNotExist:
+        context = {}
     return render(request, "about-le-lle.html", context=context)
 
 
@@ -249,7 +252,10 @@ def about_physicochemistry(request):
 
 
 def about_pca(request):
-    context = {"pca_biplot_data": PcaBiplotData.objects.get().pca_biplot_data}
-    pca_biplot = json.loads(PcaBiplotData.objects.get().pca_biplot_data)
-    context["pca_biplot_cc"] = pca_biplot["correlation_circle"]
+    try:
+        context = {"pca_biplot_data": PcaBiplotData.objects.get().pca_biplot_data}
+        pca_biplot = json.loads(PcaBiplotData.objects.get().pca_biplot_data)
+        context["pca_biplot_cc"] = pca_biplot["correlation_circle"]
+    except PcaBiplotData.DoesNotExist:
+        context = {}
     return render(request, "about-pca.html", context=context)