Update external_resources.rb

Author: lmrodriguezr

app/models/genome/external_resources.rb

@@ -51,7 +51,7 @@ def reload_source_json!
   # String (or +nil+)
   def external_sra_to_biosample(acc)
     sr = SequencingExperiment.by_sra(acc)
-    ephemeral_report << sr.try(:ephemeral_report)
+    ephemeral_report << (sr.try(:ephemeral_report) || 'No SRA experiments')
     sr.try(:biosample_accession)
   end
 
@@ -67,7 +67,7 @@ def external_biosample_to_sra(acc)
     ng.xpath('//result/entries/entry').map do |exp|
       sra_acc = exp['acc'] || exp['id'] or next
       sr = SequencingExperiment.find_or_create_by(sra_accession: sra_acc)
-      ephemeral_report << sr.try(:ephemeral_report)
+      ephemeral_report << (sr.try(:ephemeral_report) || 'No SRA experiments')
     end
   end