fix shortest path query

sg-backend/.gitignore

-__pycache/
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+__pycache
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sg-backend/db.py

@@ -41,10 +41,13 @@ class Neo4j:
             #                             RETURN n,r,m""", software1=SoftwareSearch.software1,
             #                       software2=SoftwareSearch.software2)
             results = session.run("""MATCH (S1:Software {name: $software1}), (S2:Software {name: $software2}),
-                                      p = shortestPath((S1)-[*]-(S2))
+                                      p = shortestPath((S1)-[:SIMILAR*]-(S2))
                                         RETURN p""",
                                   software1=search.software1,
                                   software2=search.software2)
-            data = results.data()[0]['p']
-            return [node for node in data if
-                    type(node) is dict]  # [node._properties.get('name') for node in results.graph().nodes]
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+            data = results.data()
+            if data:
+                return [node for node in data[0]['p'] if type(node) is dict]
+                # [node._properties.get('name') for node in results.graph().nodes]
+            else:
+                return []
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