Summary:
`setComponentDescriptorProviderRequest` is only used on iOS for dynamic registration of additional components. This variable is not default initialized, so will point to invalid memory when a component is missing and thus crash.
Changelog: [Internal] Fix Android crash when component is missing
Reviewed By: rubennorte
Differential Revision: D43305656
fbshipit-source-id: 70dd2973d50abbfcc19e051bd24c1deb90883941