replace missing values in scenario data with zeroes

Author: romainsacchi

pathways/data/classifications.csv

@@ -3449,4 +3449,5 @@ hard coal mine operation and hard coal preparation,hard coal,0510:Mining of hard
 "bioethanol, from forest residues, burned in passenger car",heat,"3510:Electric power generation, transmission and distribution",17300: Steam and hot water
 "bioethanol, from sugar crops, burned in passenger car",heat,"3510:Electric power generation, transmission and distribution",17300: Steam and hot water
 "forest residues, burned in furnace 1000kW","heat","3510:Electric power generation, transmission and distribution",17300: Steam and hot water
-"market for kerosene","kerosene",1920:Manufacture of refined petroleum products,33371: Kerosene
+"market for kerosene","kerosene",1920:Manufacture of refined petroleum products,33371: Kerosene
+"electricity production, nuclear, Small Modular Reactor (SMR)","electricity, high voltage","3510:Electric power generation, transmission and distribution"

pathways/data/technologies_shares.yaml

@@ -45,6 +45,10 @@ Wind:
         maximum: 0.10
         uncertainty_type: uniform
 PV:
+  _targets:
+    - name: electricity production, photovoltaic, commercial
+      reference product: electricity, low voltage
+      unit: kilowatt hour
   c-Si:
     name: electricity production, photovoltaic, photovoltaic slanted-roof installation, 3 kWp, multi-Si, laminated, integrated
     reference product: electricity, low voltage