pEpSQLite - Exception on execute() on closed db. (not segfault)

src/pEpSQLite.cc

@@ -20,6 +20,7 @@ namespace pEp {
         int rc{::sqlite3_open(db_path.c_str(), &db)};
 
         if (rc) {
+            ::sqlite3_close(db);
             runtime_error e{string("Can't open database (" + db_path + "): " + ::sqlite3_errmsg(db))};
             throw (e);
         }
@@ -62,6 +63,10 @@ namespace pEp {
 
     ResultSet pEpSQLite::execute(const string& stmt)
     {
+        if(db == nullptr) {
+            runtime_error e{string("execute(): - Error: db is not open")};
+            throw (e);
+        } else {
             pEpLogClass("called");
             this->resultset.clear();
             char *zErrMsg = nullptr;
@@ -71,6 +76,7 @@ namespace pEp {
                 ::sqlite3_free(zErrMsg);
                 throw (e);
             }
+        }
         return resultset;
     }