Backport impress#1266: Fix bug in live reload

Refs: metarhia/impress#1266
Closes: #177
PR-URL: #181

Author: tshemsedinov

lib/application.js

@@ -49,14 +49,15 @@ class Application extends events.EventEmitter {
   }
 
   async createScript(fileName) {
-    const code = await fsp.readFile(fileName, 'utf8');
-    const src = '\'use strict\';\ncontext => ' + code;
-    const options = { filename: fileName, lineOffset: -1 };
     try {
+      const code = await fsp.readFile(fileName, 'utf8');
+      if (!code) return null;
+      const src = '\'use strict\';\ncontext => ' + code;
+      const options = { filename: fileName, lineOffset: -1 };
       const script = new vm.Script(src, options);
       return script.runInContext(this.sandbox, SCRIPT_OPTIONS);
     } catch (err) {
-      this.logger.error(err.stack);
+      if (err.code !== 'ENOENT') this.logger.error(err.stack);
       return null;
     }
   }
@@ -74,8 +75,7 @@ class Application extends events.EventEmitter {
       const data = await fsp.readFile(filePath);
       this.static.set(key, data);
     } catch (err) {
-      this.logger.error(err.stack);
-      if (err.code !== 'ENOENT') throw err;
+      if (err.code !== 'ENOENT') this.logger.error(err.stack);
     }
   }