Check for null before parsing toDouble

Author: MichaelMarner

modules/swagger-codegen/src/main/resources/dart/class.mustache

@@ -29,7 +29,7 @@ class {{classname}} {
       {{/isListContainer}}
       {{^isListContainer}}
         {{#isDouble}}
-        json['{{baseName}}'].toDouble()
+        json['{{baseName}}'] == null ? null : json['{{baseName}}'].toDouble()
         {{/isDouble}}
         {{^isDouble}}
         json['{{baseName}}']

samples/client/petstore/dart/flutter_petstore/swagger/lib/model/amount.dart

@@ -17,7 +17,7 @@ class Amount {
   Amount.fromJson(Map<String, dynamic> json) {
     if (json == null) return;
     value =
-        json['value'].toDouble()
+        json['value'] == null ? null : json['value'].toDouble()
     ;
     currency =
 

samples/client/petstore/dart/swagger-browser-client/lib/model/amount.dart

@@ -17,7 +17,7 @@ class Amount {
   Amount.fromJson(Map<String, dynamic> json) {
     if (json == null) return;
     value =
-        json['value'].toDouble()
+        json['value'] == null ? null : json['value'].toDouble()
     ;
     currency =
 

samples/client/petstore/dart/swagger/lib/model/amount.dart

@@ -17,7 +17,7 @@ class Amount {
   Amount.fromJson(Map<String, dynamic> json) {
     if (json == null) return;
     value =
-        json['value'].toDouble()
+        json['value'] == null ? null : json['value'].toDouble()
     ;
     currency =