Some exceptions may not be interceptable in release code

git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/branches/3.0@3589 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61

src/AddIns/Misc/Debugger/Debugger.Core/Project/Src/Control/Thread.cs

@@ -233,6 +233,9 @@ namespace Debugger
 					return false;
 				}
 				throw;
+			} catch (ArgumentException) {
+				// May happen in release code with does not have any symbols
+				return false;
 			}
 			
 			Process.AsyncContinue(DebuggeeStateAction.Keep);