feat: Make iData value optional (dft to empty str)

Author: kadler

src/itoolkit/itoolkit.py

@@ -622,10 +622,10 @@ class iData (iBase): # noqa N801
         http://yips.idevcloud.com/wiki/index.php/XMLService/DataTypes
 
     .. versionchanged:: 1.6.3
-        `ival` now supports non-string parameters.
+        `ival` is now optional and supports non-string parameters.
     """
 
-    def __init__(self, ikey, itype, ival, iopt={}):
+    def __init__(self, ikey, itype, ival="", iopt={}):
         opts = {
             'i': ikey,
             'k': 'data',

tests/test_unit_data.py

@@ -45,3 +45,15 @@ def test_data_and_options():
     for k, v in opts.items():
         assert(element.attrib[k] == str(v))
     assert(element.text == value)
+
+
+def test_data_default_value():
+    key = 'madsn'
+    datatype = '10a'
+
+    element = ET.fromstring(iData(key, datatype).xml_in())
+
+    assert(element.tag == 'data')
+    assert(element.attrib['var'] == key)
+    assert(element.attrib['type'] == datatype)
+    assert(element.text is None)