Small fixes for warnings

js/components/ascribe_routes/proxy_handler.js

@@ -80,8 +80,8 @@ export function ProxyHandler(...redirectFunctions) {
             displayName: 'ProxyHandler',
 
             propTypes: {
-                // Provided from AscribeApp
-                currentUser: React.PropTypes.object.isRequired,
+                // Provided from AscribeApp, after the routes have been initialized
+                currentUser: React.PropTypes.object,
                 whitelabel: React.PropTypes.object,
 
                 // Provided from router

js/components/ascribe_uploader/ascribe_file_drag_and_drop/file_drag_and_drop_dialog.js

@@ -84,6 +84,7 @@ let FileDragAndDropDialog = React.createClass({
                 dialogElement = [
                     this.getDragDialog(fileClassToUpload.plural),
                     (<span
+                        key='mutlipleFilesBtn'
                         className="btn btn-default"
                         onClick={onClick}>
                             {getLangText('choose %s to upload', fileClassToUpload.plural)}
@@ -96,6 +97,7 @@ let FileDragAndDropDialog = React.createClass({
                 dialogElement = [
                     this.getDragDialog(fileClassToUpload.singular),
                     (<span
+                        key='singleFileBtn'
                         className="btn btn-default"
                         onClick={onClick}>
                             {dialog}

js/components/ascribe_uploader/react_s3_fine_uploader.js

@@ -487,7 +487,7 @@ const ReactS3FineUploader = React.createClass({
         return (enableLocalHashing && !uploadMethod) ||
                 !areAssetsEditable ||
                 (showErrorPrompt && errorState.errorClass) ||
-                (!multiple && filesToDisplay.length);
+                (!multiple && filesToDisplay.length > 0);
     },
 
     isFileValid(file) {