Fixed crashes when printing messages containing braces.

Signed-off-by: Dimitar Dobrev <dpldobrev@protonmail.com>

src/Core/Diagnostics.cs

@@ -61,7 +61,7 @@ namespace CppSharp
             var diagInfo = new DiagnosticInfo
             {
                 Kind = DiagnosticKind.Debug,
-                Message = string.Format(msg, args)
+                Message = args.Any() ? string.Format(msg, args) : msg
             };
 
             Implementation.Emit(diagInfo);
@@ -72,7 +72,7 @@ namespace CppSharp
             var diagInfo = new DiagnosticInfo
             {
                 Kind = DiagnosticKind.Message,
-                    Message = string.Format(msg, args)
+                Message = args.Any() ? string.Format(msg, args) : msg
             };
 
             Implementation.Emit(diagInfo);
@@ -83,7 +83,7 @@ namespace CppSharp
             var diagInfo = new DiagnosticInfo
             {
                 Kind = DiagnosticKind.Warning,
-                Message = string.Format(msg, args)
+                Message = args.Any() ? string.Format(msg, args) : msg
             };
 
             Implementation.Emit(diagInfo);