Fix 8872: Crash in LifetimeStore when there is no scope for variable

This fixes crash in:

```cpp
struct edit_line_paste_over {
    void operator()(agi::Context *c) override {
        paste_lines(c, true, [&](AssDialogue *new_line) -> AssDialogue * {
            AssDialogue *ret = paste_over(c->parent, pasteOverOptions, new_line, static_cast<AssDialogue*>(&*pos));
            return ret;
          });
    }
};
```

lib/valueflow.cpp

@@ -2751,6 +2751,8 @@ static void valueFlowLifetime(TokenList *tokenlist, SymbolDatabase*, ErrorLogger
 
             auto isCapturingVariable = [&](const Variable *var) {
                 const Scope *scope = var->scope();
+                if (!scope)
+                    return false;
                 if (scopes.count(scope) > 0)
                     return false;
                 if (scope->isNestedIn(bodyScope))

test/testautovariables.cpp

@@ -1510,6 +1510,7 @@ private:
               "}\n");
         ASSERT_EQUALS("", errout.str());
 
+        <<<<<<< HEAD
         <<<<<<< HEAD
         check("void f() {\n"
               "    struct b {\n"
@@ -1540,6 +1541,38 @@ private:
                     "    A &&a = T{1, 2, 3}[1]();\n"
                     "}\n");
               ASSERT_EQUALS("", errout.str());
+              =======
+                  // Make sure we dont hang
+                  check("struct A;\n"
+                        "void f() {\n"
+                        "    using T = A[3];\n"
+                        "    A &&a = T{1, 2, 3}[1];\n"
+                        "}\n");
+              ASSERT_EQUALS("", errout.str());
+
+              // Make sure we dont hang
+              check("struct A;\n"
+                    "void f() {\n"
+                    "    using T = A[3];\n"
+                    "    A &&a = T{1, 2, 3}[1]();\n"
+                    "}\n");
+              ASSERT_EQUALS("", errout.str());
+
+              // Crash #8872
+              check("struct a {\n"
+                    "  void operator()(b c) override {\n"
+                    "    d(c, [&] { c->e });\n"
+                    "  }\n"
+                    "};\n");
+              ASSERT_EQUALS("", errout.str());
+
+              check("struct a {\n"
+                    "  void operator()(b c) override {\n"
+                    "    d(c, [=] { c->e });\n"
+                    "  }\n"
+                    "};\n");
+              ASSERT_EQUALS("", errout.str());
+              >>>>>>> 6586f2d354d3f9dc26d830b6e641f158a5c58432
     }
 
     void danglingLifetimeFunction() {