Check for null schema

Author: michaeldavis-wf

src/main/java/io/swagger/codegen/v3/generators/DefaultCodegenConfig.java

@@ -2376,16 +2376,20 @@ public CodegenParameter fromParameter(Parameter parameter, Set<String> imports)
             LOGGER.info("working on Parameter " + parameter.getName());
         }
 
-        // move the defaultValue for headers and query params
+        // move the defaultValue for headers, forms and params
         if (parameter instanceof QueryParameter) {
             QueryParameter qp = (QueryParameter) parameter;
-            if(qp.getSchema().getDefault() != null) {
-                codegenParameter.defaultValue = qp.getSchema().getDefault().toString();
+            if (qp.getSchema() != null) {
+                if (qp.getSchema().getDefault() != null) {
+                    codegenParameter.defaultValue = qp.getSchema().getDefault().toString();
+                }
             }
         } else if (parameter instanceof HeaderParameter) {
             HeaderParameter hp = (HeaderParameter) parameter;
-            if(hp.getSchema().getDefault() != null) {
-                codegenParameter.defaultValue = hp.getSchema().getDefault().toString();
+            if (hp.getSchema() != null) {
+                if (hp.getSchema().getDefault() != null) {
+                    codegenParameter.defaultValue = hp.getSchema().getDefault().toString();
+                }
             }
         }