Fix several file processings (#2968)

* Ignore image error in person

* Fix hang while processing empty file

src/remote/activitypub/models/person.ts

@@ -190,7 +190,7 @@ export async function createPerson(uri: string, resolver?: Resolver): Promise<IU
 	].map(img =>
 		img == null
 			? Promise.resolve(null)
-			: resolveImage(user, img)
+			: resolveImage(user, img).catch(() => null)
 	)));
 
 	const avatarId = avatar ? avatar._id : null;
@@ -276,7 +276,7 @@ export async function updatePerson(uri: string, resolver?: Resolver, hint?: obje
 	].map(img =>
 		img == null
 			? Promise.resolve(null)
-			: resolveImage(exist, img)
+			: resolveImage(exist, img).catch(() => null)
 	)));
 
 	// Update user

src/services/drive/add-file.ts

@@ -185,6 +185,10 @@ export default async function(
 					// 種類が同定できなかったら application/octet-stream にする
 					res(['application/octet-stream', null]);
 				}
+			})
+			.on('end', () => {
+				// maybe 0 bytes
+				res(['application/octet-stream', null]);
 			});
 	});