Do not fail if contracts folder is missing

packages/cli/src/models/compiler/solidity/SolidityProjectCompiler.ts

@@ -101,6 +101,8 @@ class SolidityProjectCompiler {
   }
 
   private _loadSoliditySourcesFromDir(dir = this.inputDir): void {
+    if (!existsSync(dir) || !lstatSync(dir).isDirectory) return;
+
     // TODO: Replace by a glob expression
     readdirSync(dir).forEach(fileName => {
       const filePath = path.resolve(dir, fileName);

packages/cli/test/models/compiler/solidity/SolidityProjectCompiler.test.js

@@ -213,6 +213,11 @@ describe('SolidityProjectCompiler', function() {
     it('compiles without errors', async function() {
       await compileProject({ inputDir, outputDir, version: '0.5.9' });
     });
+
+    it('compiles without errors if input dir does not exist', async function() {
+      const inputDir = `${rootDir}/test/mocks/mock-stdlib-empty/not-exists`;
+      await compileProject({ inputDir, outputDir, version: '0.5.9' });
+    });
   });
 
   describe('in mock-project-with-root-imports project', function() {