Island: Add default value for Machine.hostname

monkey/monkey_island/cc/models/machine.py

@@ -29,7 +29,7 @@ class Machine(MutableInfectionMonkeyBaseModel):
     operating_system_version: str = Field(default="")
     """The specific version of the operating system the machine is running"""
 
-    hostname: str
+    hostname: str = Field(default="")
     """The hostname of the machine"""
 
     _make_immutable_sequence = validator("network_interfaces", pre=True, allow_reuse=True)(

monkey/tests/unit_tests/monkey_island/cc/models/test_machine.py

@@ -194,3 +194,12 @@ def test_set_hostname():
 
     # Raises exception_on_failure
     m.operating_system_version = "wopr"
+
+
+def test_hostname_default_value():
+    missing_hostname_dict = MACHINE_OBJECT_DICT.copy()
+    del missing_hostname_dict["hostname"]
+
+    m = Machine(**missing_hostname_dict)
+
+    assert m.hostname == ""