Merge pull request #78 from BBasile/issue-77

fix #77 - Crash due to #74
merged-on-behalf-of: BBasile <BBasile@users.noreply.github.com>

src/dsymbol/conversion/first.d

@@ -604,7 +604,7 @@ final class FirstPass : ASTVisitor
 
 	override void visit(const IfStatement ifs)
 	{
-		if (ifs.identifier != tok!"")
+		if (ifs.identifier != tok!"" && ifs.thenStatement)
 		{
 			pushScope(ifs.thenStatement.startLocation, ifs.thenStatement.endLocation);
 			scope(exit) popScope();