fix(cordova-build): only set sourceMap if specified (#107)

Author: Joel Cogen

builders/cordova-build/index.ts

@@ -47,7 +47,9 @@ export class CordovaBuildBuilder implements Builder<CordovaBuildBuilderSchema> {
   prepareBrowserConfig(options: CordovaBuildBuilderSchema, browserOptions: BrowserBuilderSchema) {
     const cordovaBasePath = normalize(options.cordovaBasePath ? options.cordovaBasePath : '.');
 
-    browserOptions.sourceMap = options.sourceMap as any;
+    if (typeof options.sourceMap !== 'undefined') {
+        browserOptions.sourceMap = options.sourceMap as any;
+    }
 
     // We always need to output the build to `www` because it is a hard
     // requirement of Cordova.