NimBLEAddress: New constructor added to create blank addresses

* Docuement NimBLEAddress::getNative in migration docs.

src/NimBLEAddress.cpp

@@ -37,6 +37,14 @@ NimBLEAddress::NimBLEAddress(ble_addr_t address) {
 } // NimBLEAddress
 
 
+/**
+ * @brief Create a blank address, i.e. 00:00:00:00:00:00, type 0.
+ */
+NimBLEAddress::NimBLEAddress() {
+    NimBLEAddress("");
+} // NimBLEAddress
+
+
 /**
  * @brief Create an address from a hex string
  *

src/NimBLEAddress.h

@@ -33,6 +33,7 @@
  */
 class NimBLEAddress {
 public:
+    NimBLEAddress();
     NimBLEAddress(ble_addr_t address);
     NimBLEAddress(uint8_t address[6], uint8_t type = BLE_ADDR_PUBLIC);
     NimBLEAddress(const std::string &stringAddress, uint8_t type = BLE_ADDR_PUBLIC);