don't show new_receive_address popup with imported wallets

gui/qt/main_window.py

@@ -785,18 +785,24 @@ class ElectrumWindow(QMainWindow):
         self.wallet.storage.put('receive_requests2', self.receive_requests)
         self.update_receive_tab()
 
-    def new_receive_address(self):
+    def get_receive_address(self):
         domain = self.wallet.get_account_addresses(self.current_account, include_change=False)
         for addr in domain:
             if not self.wallet.history.get(addr) and addr not in self.receive_requests.keys():
-                break
-        else:
+                return addr
+
+    def new_receive_address(self):
+        addr = self.get_receive_address()
+        if addr is None:
             if isinstance(self.wallet, Imported_Wallet):
                 self.show_message(_('No more addresses in your wallet.'))
                 return
             if not self.question(_("Warning: The next address will not be recovered automatically if you restore your wallet from seed; you may need to add it manually.\n\nThis occurs because you have too many unused addresses in your wallet. To avoid this situation, use the existing addresses first.\n\nCreate anyway?")):
                 return
             addr = self.wallet.create_new_address(self.current_account, False)
+        self.set_receive_address(addr)
+
+    def set_receive_address(self, addr):
         self.receive_address_e.setText(addr)
         self.receive_message_e.setText('')
         self.receive_amount_e.setAmount(None)
@@ -850,7 +856,9 @@ class ElectrumWindow(QMainWindow):
         current_address = self.receive_address_e.text()
         domain = self.wallet.get_account_addresses(self.current_account, include_change=False)
         if not current_address in domain:
-            self.new_receive_address()
+            addr = self.get_receive_address()
+            if addr:
+                self.set_receive_address(addr)
 
         # clear the list and fill it again
         self.receive_list.clear()