cancel editing better when not logged in

Fixes a bug where annotating while not logged in would cause
persistent highlights and break the `back` functionality.

h/js/src/annotator.host.coffee

@@ -217,8 +217,12 @@ class Annotator.Host extends Annotator
       hash: annotation.hash
     if not stub.hash
       @consumer.createAnnotation (hash) =>
-        annotation.hash = stub.hash = hash
-        @consumer.showEditor stub
+        if not hash?
+          this.deleteAnnotation annotation
+          @ignoreMouseup = false
+        else
+          annotation.hash = stub.hash = hash
+          @consumer.showEditor stub
     else
       @consumer.showEditor stub
 

h/js/src/controllers.coffee

@@ -41,20 +41,20 @@ class Hypothesis extends Annotator
             this.publish event, [annotation]
         addPlugin: => this.addPlugin arguments...
         createAnnotation: =>
-          @cache[h = ++@hash] = this.createAnnotation()
-          h
+          if @plugins.Permissions.user?
+            @cache[h = ++@hash] = this.createAnnotation()
+            h
+          else
+            this.showAuth true
+            this.show()
+            null
         showEditor: (stub) =>
           h = stub.hash
           annotation = $.extend @cache[h], stub,
             hash:
               toJSON: => undefined
               valueOf: => h
-          if @plugins.Permissions.user?
-            this.showEditor annotation
-          else
-            @editor.hide()
-            this.showAuth true
-            this.show()
+          this.showEditor annotation
         # This guy does stuff when you "back out" of the interface.
         # (Currently triggered by a click on the source page.)
         back: =>