Fix issues with from_partial method implementations (#200)

See boa-dev/boa#4167 for reference on fixes

Author: nekevss

src/builtins/core/date.rs

@@ -358,7 +358,7 @@ impl PlainDate {
             partial.year.is_some() || (partial.era.is_some() && partial.era_year.is_some());
         let month_check = partial.month.is_some() || partial.month_code.is_some();
         if !year_check || !month_check || partial.day.is_none() {
-            return Err(TemporalError::range().with_message("Invalid PlainDate fields provided."));
+            return Err(TemporalError::r#type().with_message("Invalid PlainDate fields provided."));
         }
 
         let overflow = overflow.unwrap_or_default();

src/builtins/core/datetime.rs

@@ -318,9 +318,12 @@ impl PlainDateTime {
         partial: PartialDateTime,
         overflow: Option<ArithmeticOverflow>,
     ) -> TemporalResult<Self> {
+        if partial.date.is_empty() && partial.time.is_empty() {
+            return Err(TemporalError::r#type().with_message("PartialDateTime cannot be empty."));
+        }
         let date = PlainDate::from_partial(partial.date, overflow)?;
-        let time = PlainTime::from_partial(partial.time, overflow)?;
-        Self::from_date_and_time(date, time)
+        let iso_time = IsoTime::default().with(partial.time, overflow.unwrap_or_default())?;
+        Self::from_date_and_time(date, PlainTime::new_unchecked(iso_time))
     }
 
     /// Creates a new `DateTime` with the fields of a `PartialDateTime`.