fix nonexistent rulesfile

Author: bsjerps

asmdisks.spec

@@ -1,6 +1,6 @@
 Name:		asmdisks
 Summary:	Replacement for Oracle ASMLib using UDEV
-Version:	2.0.1
+Version:	2.0.2
 Release:	1%{?dtap}
 BuildArch:	noarch
 License:	GPLv3+

src/lib/rulesfile.py

@@ -77,9 +77,12 @@ def save(self):
             f.write(footer)
 
     def dump(self):
-        with open(self.path) as f:
-            data = f.read()
-            print(data)
+        try:
+            with open(self.path) as f:
+                data = f.read()
+                print(data)
+        except FileNotFoundError:
+            raise ValueError(f"Rules file does not exist (yet) - {self.path}")
 
     @staticmethod
     def reload():