Merge remote-tracking branch 'rosey/fix_paste' into develop

Author: ngs

src/__test__/plugin-test.js

@@ -387,6 +387,14 @@ describe('draft-js-markdown-shortcuts-plugin', () => {
               expect(modifierSpy).to.have.been.calledWith(currentEditorState, 'hello');
             });
           });
+          describe('non-string empty value in clipboard', () => {
+            beforeEach(() => {
+              pastedText = null;
+            });
+            it('returns not-handled', () => {
+              expect(subject()).to.equal('not-handled');
+            });
+          });
           describe('pasted just text with new line code', () => {
             beforeEach(() => {
               pastedText = 'hello\nworld';

src/index.js

@@ -152,6 +152,11 @@ const createMarkdownShortcutsPlugin = (config = { insertEmptyBlockOnReturnWithMo
       if (html) {
         return 'not-handled';
       }
+
+      if (!text) {
+        return 'not-handled';
+      }
+
       let newEditorState = editorState;
       let buffer = [];
       for (let i = 0; i < text.length; i += 1) {