Add catch handlers to client calls

Summary:
Client calls return a promise. Not dealing with the error causes promise unhandled rejection errors.

This change adds a catch block and logs the error instead.

Reviewed By: antonk52

Differential Revision: D37955029

fbshipit-source-id: 50cac5a5339961d16868ab2102d3c77790e6943c

desktop/plugins/public/leak_canary/index.tsx

@@ -130,7 +130,9 @@ export default class LeakCanary<PersistedState> extends FlipperPlugin<
       selectedIdx: null,
       selectedEid: null,
     });
-    this.client.call('clear');
+    this.client.call('clear').catch((e) => {
+      console.warn('[LeakCanary] clear failed with error', e);
+    });
   };
 
   _selectElement = (leakIdx: number, eid: string) => {