feat(extra-info): add method to handle info retrieval error

BaseExtraInfoInjection now has a new overridable method
injectOnInfoRetrievalError which is called when an error ocurred while
trying to obtain the current information. This will be used in the
future to inject an error message/chip.

Bug: twpowertools:93
Change-Id: I64f3784a28db3976fdfb6e4e66949d842c4ff4fa
diff --git a/src/contentScripts/communityConsole/extraInfo/injections/base.js b/src/contentScripts/communityConsole/extraInfo/injections/base.js
index 1498efd..ee997c4 100644
--- a/src/contentScripts/communityConsole/extraInfo/injections/base.js
+++ b/src/contentScripts/communityConsole/extraInfo/injections/base.js
@@ -21,6 +21,13 @@
     shouldImplement('inject');
   }
 
+  /**
+   * Overridable method which is called when an error ocurred while retrieving
+   * the info needed to inject the extra information. This is useful to show an
+   * error component in the screen.
+   */
+  injectOnInfoRetrievalError() {}
+
   async isEnabled() {
     return await this.optionsWatcher.isEnabled('extrainfo');
   }
@@ -33,6 +40,10 @@
     if (!isEnabled) return;
 
     return this.infoHandler.getCurrentInfo(injectionDetails)
+        .catch(err => {
+          this.injectOnInfoRetrievalError();
+          throw err;
+        })
         .then(info => this.inject(info, injectionDetails))
         .catch(err => {
           console.error(