Move no url back to warning temporarily (#520)

Author: Mpdreamz

src/Elastic.Markdown/Myst/InlineParsers/DiagnosticLinkInlineParser.cs

@@ -119,7 +119,7 @@ private bool ValidateBasicUrl(LinkInline link, InlineProcessor processor, string
 	{
 		if (string.IsNullOrEmpty(url))
 		{
-			processor.EmitError(link, "Found empty url");
+			processor.EmitWarning(link, "Found empty url");
 			return false;
 		}
 

tests/authoring/Inline/InlineLinks.fs

@@ -54,7 +54,7 @@ type ``empty link should result in an error`` () =
 """
 
     [<Fact>]
-    let ``has no errors`` () = markdown |> hasError "Found empty url"
+    let ``should warn`` () = markdown |> hasWarning "Found empty url"
 
     [<Fact>]
-    let ``has warning`` () = markdown |> hasNoWarnings
+    let ``has no erros`` () = markdown |> hasNoErrors