Similarity calc: Error handling if layers contain no clusters

src/data-hub/role-stage-discovery-microservice/app/processing/similarityFiles/dataInput.py

@@ -94,6 +94,7 @@ def getClusterDataFromMongo(layerNameList,limitNrCluster,limitNrNodes):
     #returns layerdiction -> Layer -> clusterDict -> Cluster -> nodesDict -> Nodes    
     for name in layerNameList:
         newData = get_mongoDB_cluster_by_layerName(name)#repo.get_clusters_for_layer(name)
+        if newData is not None and len(newData) != 0:
             layerDict = populateWithNewNodesSingleLayer(newData[0:limitNrCluster],layerDict,limitNrNodes)
 
     return layerDict

src/data-hub/role-stage-discovery-microservice/app/similarityMain.py

@@ -14,6 +14,12 @@ import math
 import datetime
 from typing import Dict
 
+### init logging ###
+import logging
+LOG_FORMAT = ('%(levelname) -5s %(asctime)s %(name)s:%(funcName) -35s %(lineno) -5d:  %(message)s')
+logging.basicConfig(level=logging.INFO, format=LOG_FORMAT)
+LOGGER = logging.getLogger(__name__)
+
 ##################AUX
 
 modules_path = '../../../modules/'
@@ -56,6 +62,9 @@ def main():
 
 
     layerDict = getClusterDataFromMongo(layerNameList,limitNrCluster,limitNrNodes)
+    if layerDict is None or len(layerDict) == 0:
+        LOGGER.error(f"None of the following layers existed: {str(layerNameList)}. Similarity calculation was not performed.")
+        return
 
     #URLlist = None
     #layerDict = getClusterDataFromSwagger(limitNrCluster,limitNrNodes, URLlist) #for Swagger, Change URLs inside the function for different input Data or provide a list with URLS