Fix #13502, #13708 fuzzing crashes

Author: web-flow

lib/templatesimplifier.cpp

@@ -690,6 +690,8 @@ bool TemplateSimplifier::getTemplateDeclarations()
             else if (Token::Match(tok2, "{|=|;")) {
                 const int namepos = getTemplateNamePosition(parmEnd);
                 if (namepos > 0) {
+                    if (!tok->scopeInfo())
+                        mTokenizer.syntaxError(tok);
                     TokenAndName decl(tok, tok->scopeInfo()->name, parmEnd->tokAt(namepos), parmEnd);
                     if (decl.isForwardDeclaration()) {
                         // Declaration => add to mTemplateForwardDeclarations
@@ -3983,6 +3985,8 @@ void TemplateSimplifier::simplifyTemplates(const std::time_t maxtime)
                 if (it->isSpecialization()) {
                     // delete the "template < >"
                     Token * tok = it->token();
+                    if (!tok)
+                        mTokenizer.syntaxError(it->nameToken());
                     tok->deleteNext(2);
                     tok->deleteThis();
                 } else {

test/cli/fuzz-crash/crash-924d1c8815a87b27a5ddd16f5f1ac5fe1aa6ea5a

@@ -0,0 +1 @@
+template<>e<t<{{template<>t<e>(){}}}>(){}

test/cli/fuzz-crash/crash-9eb2c9e545b361a17d74ccd4e8c933ca65542b12

@@ -0,0 +1 @@
+{template<>i}template<>fact2(){fact2<3>()}