refactor: JwtHandler에서의 빈 토큰값 예외 처리 추가

src/main/kotlin/roomescape/auth/infrastructure/jwt/JwtHandler.kt

@@ -37,6 +37,8 @@ class JwtHandler(
                     .body
                     .get(MEMBER_ID_CLAIM_KEY, Number::class.java)
                     .toLong()
+        } catch (_: IllegalArgumentException) {
+            throw AuthException(AuthErrorCode.TOKEN_NOT_FOUND)
         } catch (_: ExpiredJwtException) {
             throw AuthException(AuthErrorCode.EXPIRED_TOKEN)
         } catch (_: Exception) {

src/test/kotlin/roomescape/auth/infrastructure/jwt/JwtHandlerTest.kt

@@ -41,7 +41,7 @@ class JwtHandlerTest : FunSpec({
         test("토큰이 빈 값이면 예외를 던진다.") {
             shouldThrow<AuthException> {
                 jwtHandler.getMemberIdFromToken("")
-            }.errorCode shouldBe AuthErrorCode.INVALID_TOKEN
+            }.errorCode shouldBe AuthErrorCode.TOKEN_NOT_FOUND
         }
 
         test("시크릿 키가 잘못된 경우 예외를 던진다.") {