add default no op implementation for remove neighbor function

src/helpers/CommonCLI.h

@@ -43,7 +43,9 @@ public:
   virtual void dumpLogFile() = 0;
   virtual void setTxPower(uint8_t power_dbm) = 0;
   virtual void formatNeighborsReply(char *reply) = 0;
-  virtual void removeNeighbor(const uint8_t* pubkey, int key_len) = 0;
+  virtual void removeNeighbor(const uint8_t* pubkey, int key_len) {
+    // no op by default
+  };
   virtual mesh::LocalIdentity& getSelfId() = 0;
   virtual void clearStats() = 0;
   virtual void applyTempRadioParams(float freq, float bw, uint8_t sf, uint8_t cr, int timeout_mins) = 0;