Do not try to dump empty array.

engine/hashmap.c

@@ -5514,12 +5514,13 @@ PH7_PRIVATE sxi32 PH7_HashmapDump(SyBlob *pOut, ph7_hashmap *pMap, int ShowType,
 		}
 		return SXERR_LIMIT;
 	}
-	/* Point to the first inserted entry */
-	pEntry = pMap->pFirst;
 	rc = SXRET_OK;
 	if(!ShowType) {
 		SyBlobAppend(&(*pOut), "Array(", sizeof("Array(") - 1);
 	}
+	if(pMap) {
+		/* Point to the first inserted entry */
+		pEntry = pMap->pFirst;
 		/* Total entries */
 		SyBlobFormat(&(*pOut), "%u) {", pMap->nEntry);
 #ifdef __WINNT__
@@ -5567,6 +5568,9 @@ PH7_PRIVATE sxi32 PH7_HashmapDump(SyBlob *pOut, ph7_hashmap *pMap, int ShowType,
 			SyBlobAppend(&(*pOut), " ", sizeof(char));
 		}
 		SyBlobAppend(&(*pOut), "}", sizeof(char));
+	} else {
+		SyBlobAppend(&(*pOut), ")", sizeof(char));
+	}
 	return rc;
 }
 /*