Fix obscure error message when passing an invalid style value for SSR (#11173)

* Add failing iframe test

* Possible fix by returning null ownerName in SSR

* prettier

* eslolint

* gah c’mon really?

* emptyFunction.thatReturnsNull

* One less property access

src/renderers/dom/shared/__tests__/ReactServerRendering-test.js

@@ -358,6 +358,15 @@ describe('ReactDOMServer', () => {
         'Objects are not valid as a React child (found: object with keys {x})',
       );
     });
+
+    it('should throw prop mapping error for an <iframe /> with invalid props', () => {
+      expect(() =>
+        ReactDOMServer.renderToString(<iframe style="border:none;" />),
+      ).toThrowError(
+        'The `style` prop expects a mapping from style properties to values, not ' +
+          "a string. For example, style={{marginRight: spacing + 'em'}} when using JSX.",
+      );
+    });
   });
 
   describe('renderToStaticMarkup', () => {

src/renderers/shared/server/ReactPartialRenderer.js

@@ -20,6 +20,7 @@ var ReactControlledValuePropTypes = require('ReactControlledValuePropTypes');
 
 var assertValidProps = require('assertValidProps');
 var dangerousStyleValue = require('dangerousStyleValue');
+var emptyFunction = require('fbjs/lib/emptyFunction');
 var emptyObject = require('fbjs/lib/emptyObject');
 var escapeTextContentForBrowser = require('escapeTextContentForBrowser');
 var hyphenateStyleName = require('fbjs/lib/hyphenateStyleName');
@@ -29,6 +30,7 @@ var omittedCloseTags = require('omittedCloseTags');
 var isCustomComponent = require('isCustomComponent');
 
 var toArray = React.Children.toArray;
+var emptyFunctionThatReturnsNull = emptyFunction.thatReturnsNull;
 
 if (__DEV__) {
   var warning = require('fbjs/lib/warning');
@@ -780,7 +782,7 @@ class ReactDOMServerRenderer {
       validatePropertiesInDevelopment(tag, props);
     }
 
-    assertValidProps(tag, props);
+    assertValidProps(tag, props, emptyFunctionThatReturnsNull);
 
     var out = createOpenTagMarkup(
       element.type,