WI #1811 Avoid null indirection (#1817)

Co-authored-by: mayanje <jeanchrysostome.mayan@e-i.com>

Author: mayanje

TypeCobol.LanguageServer/TypeCobolServer.cs

@@ -779,7 +779,7 @@ protected override SignatureHelp OnSignatureHelp(TextDocumentPosition parameters
             if (docContext.FileCompiler?.CompilationResultsForProgram?.ProcessedTokensDocumentSnapshot == null) //Semantic snapshot is not available
                 return null;
 
-            var wrappedCodeElement = CodeElementFinder(docContext.FileCompiler, parameters.position).FirstOrDefault();
+            var wrappedCodeElement = CodeElementFinder(docContext.FileCompiler, parameters.position)?.FirstOrDefault();
             if (wrappedCodeElement == null) //No codeelements found
                 return null;