remove default empty string

application/Espo/Modules/Crm/Resources/metadata/entityDefs/Contact.json

@@ -10,14 +10,12 @@
         },
         "firstName": {
             "type": "varchar",
-            "maxLength": 100,
-            "default": ""
+            "maxLength": 100
         },
         "lastName": {
             "type": "varchar",
             "maxLength": 100,
-            "required": true,
-            "default": ""
+            "required": true
         },
         "accountAnyId": {
             "notStorable": true,

application/Espo/Modules/Crm/Resources/metadata/entityDefs/Lead.json

@@ -15,13 +15,11 @@
         },
         "firstName": {
             "type": "varchar",
-            "maxLength": 100,
-            "default": ""
+            "maxLength": 100
         },
         "lastName": {
             "type": "varchar",
-            "maxLength": 100,
-            "default": ""
+            "maxLength": 100
         },
         "title": {
             "type": "varchar",
@@ -67,7 +65,6 @@
             "view": "crm:views/lead/fields/industry",
             "customizationOptionsDisabled": true,
             "optionsReference": "Account.industry",
-            "default": "",
             "isSorted": true
         },
         "opportunityAmount": {

application/Espo/Resources/metadata/entityDefs/Preferences.json

@@ -113,8 +113,7 @@
         },
         "signature": {
             "type": "wysiwyg",
-            "view": "views/preferences/fields/signature",
-            "default": ""
+            "view": "views/preferences/fields/signature"
         },
         "defaultReminders": {
             "type": "jsonArray",