weather output, map nullcheck

app/blocks/math/map.js

@@ -63,7 +63,7 @@ export default {
   generators: {
     json: (block, generator) => {
       const
-        value = JSON.parse(generator.valueToCode(block, 'VALUE', 0)),
+        value = JSON.parse(generator.valueToCode(block, 'VALUE', 0) || null),
         from = JSON.parse(generator.valueToCode(block, 'FROM_RANGE', 0)),
         to = JSON.parse(generator.valueToCode(block, 'TO_RANGE', 0)),
         payload = { mapValue: { value, from, to }}

app/blocks/power_ups/weather.js

@@ -9,6 +9,11 @@ export default {
   ioPlus: true,
   description: "Fetch the current or forecast weather conditions at the specified location.",
 
+  connections: {
+    mode: "value",
+    output: "expression",
+  },
+
   mixins: [
     'replaceDropdownOptions',
     { weatherMixin }