Minor improvements to <Hotkeys /> component (#7261)

* left align, close to button it's related to
* text-muted, so it's a bit more subtle
* fix required func props, where no func it actually passed

superset/assets/src/components/Hotkeys.jsx

@@ -25,7 +25,7 @@ const propTypes = {
   hotkeys: PropTypes.arrayOf(PropTypes.shape({
     key: PropTypes.string.isRequired,
     descr: PropTypes.string.isRequired,
-    func: PropTypes.func.isRequired,
+    func: PropTypes.func,
   })).isRequired,
   header: PropTypes.string,
   placement: PropTypes.string,
@@ -38,7 +38,9 @@ const defaultProps = {
 export default class Hotkeys extends React.PureComponent {
   componentDidMount() {
     this.props.hotkeys.forEach((keyConfig) => {
-      Mousetrap.bind([keyConfig.key], keyConfig.func);
+      if (keyConfig.func) {
+        Mousetrap.bind([keyConfig.key], keyConfig.func);
+      }
     });
   }
   renderPopover() {

superset/assets/src/explore/components/ExploreViewContainer.jsx

@@ -47,17 +47,11 @@ const keymap = {
     SAVE: 'ctrl + s',
 };
 
-const getHotKeys = () => {
-  const d = [];
-  Object.keys(keymap).forEach((k) => {
-    d.push({
-      name: k,
-      descr: keymap[k],
-      key: k,
-    });
-  });
-  return d;
-};
+const getHotKeys = () => Object.keys(keymap).map(k => ({
+  name: k,
+  descr: keymap[k],
+  key: k,
+}));
 
 const propTypes = {
   actions: PropTypes.object.isRequired,
@@ -321,7 +315,7 @@ class ExploreViewContainer extends React.Component {
         )}
         <div className="row">
           <div className="col-sm-4">
-            <div style={{ display: 'flex', flexDirection: 'row', alignItems: 'center', justifyContent: 'space-between' }}>
+            <div style={{ display: 'flex', flexDirection: 'row', alignItems: 'center' }}>
               <QueryAndSaveBtns
                 canAdd="True"
                 onQuery={this.onQuery}
@@ -332,7 +326,7 @@ class ExploreViewContainer extends React.Component {
                 errorMessage={this.renderErrorMessage()}
                 datasourceType={this.props.datasource_type}
               />
-              <div>
+              <div className="m-l-5 text-muted">
                 <Hotkeys
                   header="Keyboard shortcuts"
                   hotkeys={getHotKeys()}