Use getKey to actually retrieve key. (#332)

`hasKey` just validates it's available

(cherry picked from commit 10643be8bb)

src/program.ts

@@ -418,6 +418,8 @@ export class Program extends BaseProgram {
             } else {
                 this.processResponse(Response.error('Vault is locked.'), true);
             }
+        } else if (!this.main.cryptoService.hasKeyInMemory()) {
+            await this.main.cryptoService.getKey();
         }
     }