Merge pull request #429 from embark-framework/bug_fix/no-sol

Early return if no sol files

lib/contracts/compiler.js

@@ -32,7 +32,10 @@ class Compiler {
           return false;
         });
 
-        compiler.call(compiler, matchingFiles || [], function (err, compileResult) {
+        if (!matchingFiles || !matchingFiles.length) {
+          return callback();
+        }
+        compiler.call(compiler, matchingFiles, function (err, compileResult) {
           Object.assign(compiledObject, compileResult);
           callback(err, compileResult);
         });

lib/modules/solidity/index.js

@@ -12,6 +12,9 @@ class Solidity {
   }
 
   compile_solidity(contractFiles, cb) {
+    if (!contractFiles.length) {
+      return cb();
+    }
     let self = this;
     let input = {};
     let solcW;