fix(overmind-react): fix old HOC usage without Overmind

Author: christianalfoni

packages/node_modules/overmind-react/src/__snapshots__/index.test.tsx.snap

@@ -1,5 +1,17 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
+exports[`React should allow using component as normal, even when not connected 1`] = `
+<h1>
+  bar
+</h1>
+`;
+
+exports[`React should allow using component as normal, even when not connected 2`] = `
+<h1>
+  nada
+</h1>
+`;
+
 exports[`React should allow using component as normal, event when connected 1`] = `
 <h1>
   bar

packages/node_modules/overmind-react/src/index.test.tsx

@@ -89,7 +89,7 @@ describe('React', () => {
     expect(tree).toMatchSnapshot()
   })
 
-  test('should allow using component as normal, event when connected', () => {
+  test('should allow using component as normal, even when not connected', () => {
     expect.assertions(2)
     const config = {
       state: {

packages/node_modules/overmind-react/src/index.ts

@@ -162,10 +162,14 @@ export const createConnect = <A extends Overmind<Configuration>>(
     if (isClassComponent) {
       const originalRender = component.prototype.render
       component.prototype.render = function() {
-        return this.props.overmind.tree.trackScope(
-          () => originalRender.call(this),
-          this.props.overmind.onUpdate
-        )
+        if (this.props.overmind) {
+          return this.props.overmind.tree.trackScope(
+            () => originalRender.call(this),
+            this.props.overmind.onUpdate
+          )
+        }
+
+        return originalRender.call(this)
       }
     }