fix(test_downstream_projects): Fix for packages with only dependencies or devDependencies block

Author: christopherthielen

test_downstream_projects.js

@@ -90,7 +90,7 @@ function installUpstreamDeps(upstreamPackages) {
 
   upstreamPackages.forEach(upstream => {
     const package = JSON.parse(fs.readFileSync('package.json'));
-    const yalcDep = package.dependencies[upstream] || package.devDependencies[upstream];
+    const yalcDep = (package.dependencies || {})[upstream] || (package.devDependencies || {})[upstream];
     package.resolutions = package.resolutions || {};
     package.resolutions[upstream] = yalcDep;
     fs.writeFileSync('package.json', JSON.stringify(package, null, 2));