Exit if no kernels.

kernels_cleaner.py

@@ -48,6 +48,9 @@ def clean_kernels():
                 version = version[:-1]
             version = [int(v) for v in version.replace('-', '.').split('.')]
             kernels.append((line.split('\t')[0], version))
+    if not kernels:
+        log('No kernels found.')
+        return 1
     log('Installed kernels:\n\t' + '\n\t'.join([n for n, v in kernels]))
     # get current kernel
     p = subprocess.Popen('uname -a', stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE, shell=True)
@@ -63,7 +66,7 @@ def clean_kernels():
             current_str = current_str[:-8]
         current = [int(v) for v in current_str.replace('-', '.').split('.')]
     except Exception as e:
-        log(RED + 'Failed to get current kernel.' + DEFAULT + '\nError: ' + e, error=True)
+        log(RED + 'Failed to get current kernel.' + DEFAULT + '\nError: ' + str(e), error=True)
         return 1
     log('Current kernel is: ' + PURPLE + current_str + DEFAULT)
     # get most recent kernel