fix: check if patch option requirement is met

src/main/kotlin/app/revanced/patcher/patch/PatchOption.kt

@@ -6,6 +6,7 @@ class NoSuchOptionException(val option: String) : Exception("No such option: $op
 class IllegalValueException(val value: Any?) : Exception("Illegal value: $value")
 class InvalidTypeException(val got: String, val expected: String) :
     Exception("Invalid option value type: $got, expected $expected")
+class RequirementNotMetException : Exception("null was passed into an option that requires a value")
 
 /**
  * A registry for an array of [PatchOption]s.
@@ -72,6 +73,9 @@ sealed class PatchOption<T>(
 ) {
     var value: T? = default
         set(value) {
+            if (value == null && required) {
+                throw RequirementNotMetException()
+            }
             if (!validator(value)) {
                 throw IllegalValueException(value)
             }

src/test/kotlin/app/revanced/patcher/patch/PatchOptionsTest.kt

@@ -39,10 +39,10 @@ internal class PatchOptionsTest {
     @Test
     fun `should be able to set value to null`() {
         // Sadly, doing:
-        // > options["key1"] = null
+        // > options["key2"] = null
         // is not possible because Kotlin
         // cannot reify the type "Nothing?".
-        options.nullify("key1")
+        options.nullify("key2")
     }
 
     @Test
@@ -65,4 +65,11 @@ internal class PatchOptionsTest {
             options["key3"] = "this value is not an allowed option"
         }
     }
+
+    @Test
+    fun `should fail because of the requirement is not met`() {
+        assertThrows<RequirementNotMetException> {
+            options.nullify("key1")
+        }
+    }
 }