Add notification when reloading stylesheets fails

spec/package-manager-spec.coffee

@@ -28,6 +28,12 @@ describe "PackageManager", ->
       expect(pack.metadata.name).toBe "package-with-invalid-styles"
       expect(pack.stylesheets.length).toBe 0
 
+      addErrorHandler = jasmine.createSpy()
+      atom.notifications.onDidAddNotification(addErrorHandler)
+      expect(-> pack.reloadStylesheets()).not.toThrow()
+      expect(addErrorHandler.callCount).toBe 2
+      expect(addErrorHandler.argsForCall[1][0].message).toContain("Failed to reload the package-with-invalid-styles package stylesheets")
+
     it "returns null if the package has an invalid package.json", ->
       addErrorHandler = jasmine.createSpy()
       atom.notifications.onDidAddNotification(addErrorHandler)

src/package.coffee

@@ -371,7 +371,12 @@ class Package
 
   reloadStylesheets: ->
     oldSheets = _.clone(@stylesheets)
-    @loadStylesheets()
+
+    try
+      @loadStylesheets()
+    catch error
+      @handleError("Failed to reload the #{@name} package stylesheets", error)
+
     @stylesheetDisposables?.dispose()
     @stylesheetDisposables = new CompositeDisposable
     @stylesheetsActivated = false