message: Remove "Message Center" button from graph error message
  Since the error message is now being shown in the error panel, it's no longer too relevant to have the button to have the message center button. User would see the same error message.
diff: @@ -9,7 +9,6 @@ import {
  EmptyStateAction
  } from 'patternfly-react';
  import { style } from 'typestyle';
  -import * as MessageCenter from '../utils/MessageCenter';
  import * as _ from 'lodash';
  import { KialiAppState } from '../store/Store';
  @@ -38,10 +37,6 @@ const emptyStateStyle = style({
  type EmptyGraphLayoutState = {};
  export class EmptyGraphLayout extends React.Component<EmptyGraphLayoutProps, EmptyGraphLayoutState> {
  - toggleMessageCenter = () => {
  - MessageCenter.toggleMessageCenter();
  - };
  -
  shouldComponentUpdate(nextProps: EmptyGraphLayoutProps) {
  const currentIsEmpty = _.isEmpty(this.props.elements.nodes);
  const nextIsEmpty = _.isEmpty(nextProps.elements.nodes);
  @@ -66,11 +61,6 @@ export class EmptyGraphLayout extends React.Component<EmptyGraphLayoutProps, Emp
  <EmptyStateIcon name="error-circle-o" />
  <EmptyStateTitle>Error loading Graph</EmptyStateTitle>
  <EmptyStateInfo>{this.props.error}</EmptyStateInfo>
  - <EmptyStateAction>
  - <Button bsStyle="primary" bsSize="large" onClick={this.toggleMessageCenter}>
  - Message Center
  - </Button>
  - </EmptyStateAction>
  </EmptyState>
  );
  }
  