fix set current file

src/app/tabs/compile-tab.js

@@ -338,7 +338,8 @@ class CompileTab {
     this._view.errorContainer = yo`<div></div>`
     this._view.contractSelection = this.contractSelection()
     this._view.compilerContainer = this.compilerContainer.render()
-    this.compilerContainer.currentFile = this._deps.fileManager.currentFile()
+    const currentFile = this._deps.fileManager.currentFile()
+    if (currentFile) this.compilerContainer.currentFile = currentFile
 
     this._view.el = yo`
       <div id="compileTabView">

src/app/tabs/compileTab/compilerContainer.js

@@ -30,7 +30,7 @@ class CompilerContainer {
   /**
    * Update the compilation button with the name of the current file
    */
-  set currentFile (name) {
+  set currentFile (name = '') {
     if (!this._view.compilationButton) return
     const button = this.compilationButton(name.split('/').pop())
     yo.update(this._view.compilationButton, button)