❌ Handle file not found case

Issue: #10

1build

@@ -78,14 +78,17 @@ def get_command_list_from_config(raw_string):
 
 
 def parse_project_config():
-    with open("1build.yaml", 'r') as stream:
-        try:
-            content = yaml.safe_load(stream)
-        except yaml.YAMLError, exc:
-            raise ValueError(
-                "Error in parsing `1build.yaml` config file. Make sure file is in correct format. \n\n" + exc.__str__()
-            )
-        return Project(name=(content["project"]), commands=(get_command_list_from_config(content["commands"])))
+    if os.path.exists("1build.yaml"):
+        with open("1build.yaml", 'r') as stream:
+            try:
+                content = yaml.safe_load(stream)
+            except yaml.YAMLError, exc:
+                raise ValueError(
+                    "Error in parsing `1build.yaml` config file. Make sure file is in correct format. \n\n" + exc.__str__()
+                )
+            return Project(name=(content["project"]), commands=(get_command_list_from_config(content["commands"])))
+    else:
+        raise ValueError("No `1build.yaml` file found in current directory.")
 
 
 def help_message(project):