Merge pull request #15307 from grafana/fixed-explore-width-0

fixed explore width-0 issue

public/app/features/explore/Explore.tsx

@@ -205,7 +205,12 @@ export class Explore extends React.PureComponent<ExploreProps> {
             <div className="explore-container">
               <QueryRows exploreEvents={this.exploreEvents} exploreId={exploreId} queryKeys={queryKeys} />
               <AutoSizer onResize={this.onResize} disableHeight>
-                {({ width }) => (
+                {({ width }) => {
+                  if (width === 0) {
+                    return null;
+                  }
+
+                  return (
                     <main className="m-t-2" style={{ width }}>
                       <ErrorBoundary>
                         {showingStartPage && <StartPage onClickExample={this.onClickExample} />}
@@ -226,7 +231,8 @@ export class Explore extends React.PureComponent<ExploreProps> {
                         )}
                       </ErrorBoundary>
                     </main>
-                )}
+                  );
+                }}
               </AutoSizer>
             </div>
           )}