change empty check

app/repositories/orient_db/learning_object_repository.rb

@@ -93,7 +93,7 @@ module OrientDb
 
       result = result.first
 
-      if !result.nil?
+      unless result.empty?
 
         if result["@class"] == "Institution"
           institution_repository.build_object(result)
@@ -295,4 +295,4 @@ module OrientDb
     end
 
   end
-end
+end
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