time: do not panic for time.parse("2020-02-02 20.02.20")!, just return an error instead (fix #16779)

vlib/time/parse.c.v

@@ -70,6 +70,9 @@ pub fn parse(s string) !Time {
 	}
 	shms := s[pos..]
 	hms := shms.split(':')
+	if hms.len != 3 {
+		return error_invalid_time(9)
+	}
 	hour_ := hms[0][1..]
 	minute_ := hms[1]
 	second_ := hms[2]

vlib/time/parse_test.v

@@ -13,12 +13,15 @@ fn test_parse() {
 }
 
 fn test_parse_invalid() {
-	s := 'Invalid time string'
+	if x := time.parse('Invalid time string') {
-	time.parse(s) or {
+		assert false
-		assert true
-		return
 	}
-	assert false
+	assert true
+
+	if x := time.parse('2020-02-02 02.20.02') {
+		assert false
+	}
+	assert true
 }
 
 fn test_parse_rfc2822() {
@@ -186,14 +189,14 @@ fn test_parse_rfc3339() {
 }
 
 fn test_ad_second_to_parse_result_in_2001() {
-	now_tm := time.parse('2001-01-01 04:00:00')?
+	now_tm := time.parse('2001-01-01 04:00:00')!
 	future_tm := now_tm.add_seconds(60)
 	assert future_tm.str() == '2001-01-01 04:01:00'
 	assert now_tm.unix < future_tm.unix
 }
 
 fn test_ad_second_to_parse_result_pre_2001() {
-	now_tm := time.parse('2000-01-01 04:00:00')?
+	now_tm := time.parse('2000-01-01 04:00:00')!
 	future_tm := now_tm.add_seconds(60)
 	assert future_tm.str() == '2000-01-01 04:01:00'
 	assert now_tm.unix < future_tm.unix