fix: remove retry button when retry not possible (#205)

checked if mediaInfo object exists in props.config, if it does - we renter the button.

this is done to prevent retry when it's not possible (e.g. when its offline)

when we will have event manager in the UI, we will use it to send an event to the player which will handle the retry instead of the UI.

src/components/error-overlay/error-overlay.js

@@ -101,6 +101,26 @@ class ErrorOverlay extends BaseComponent {
     }
   }
 
+
+  /**
+   * render the retry button
+   *
+   * @returns {React$Element} - main state element
+   * @memberof ErrorOverlay
+   */
+  renderRetryButton(): React$Element<any> | void {
+    if (this.props.config.mediaInfo) {
+      return (
+        <div className={style.controlButtonContainer} onClick={() => this.handleClick()}>
+          <button className={[style.controlButton, style.retryBtn].join(' ')}><Text id='core.retry'/></button>
+        </div>
+      )
+    } else {
+      return undefined;
+    }
+  }
+
+
   /**
    * render main state
    *
@@ -146,9 +166,7 @@ class ErrorOverlay extends BaseComponent {
               <div className={style.headline}>{this.props.errorHead ? this.props.errorHead :
                 <Text id={'error.default_error'}/>}</div>
               {this.renderSessionID()}
-              <div className={style.controlButtonContainer} onClick={() => this.handleClick()}>
-                <button className={[style.controlButton, style.retryBtn].join(' ')}><Text id='core.retry'/></button>
-              </div>
+              {this.renderRetryButton()}
             </div>
           </Overlay>
         </div>