Fix seg fault when mercury initialization fails (#283)

* check for NULL paramterse in hash table

* Committing clang-format changes

---------

Co-authored-by: github-actions <github-actions[bot]@users.noreply.github.com>
Co-authored-by: Jean Luca Bez <[email protected]>

Author: 3 people

src/commons/collections/pdc_hash_table.c

@@ -542,6 +542,12 @@ unsigned int
 hash_table_num_entries(HashTable *hash_table)
 {
     FUNC_ENTER(NULL);
+
+    if (hash_table == NULL) {
+        LOG_WARNING("hash_table was NULL\n");
+        FUNC_LEAVE(0);
+    };
+
     FUNC_LEAVE(hash_table->entries);
 }
 
@@ -552,6 +558,15 @@ hash_table_iterate(HashTable *hash_table, HashTableIterator *iterator)
 
     unsigned int chain;
 
+    if (hash_table == NULL) {
+        LOG_WARNING("hash_table was NULL\n");
+        FUNC_LEAVE_VOID();
+    }
+    if (iterator == NULL) {
+        LOG_WARNING("iterator was NULL\n");
+        FUNC_LEAVE_VOID();
+    }
+
     iterator->hash_table = hash_table;
 
     /* Default value of next if no entries are found. */