check if package exists

neb/src/install.py

@@ -2,6 +2,7 @@ from .console import print_error_message
 from .util import ensure_libs_env, comet_dir, get_package_index
 
 import os
+import sys
 
 
 def install(args):
@@ -22,4 +23,10 @@ def install(args):
                 return
             
         index = get_package_index()
+        
+        package = index.get(name, None)
+        if package == None:
+            print_error_message(f"No package was found with the name \"{name}\"")
+            sys.exit(1)
+        
         print(index)