src/bin/sage-venv-config: Do not fail if sage_conf is not available

[mkoeppe]

(from #30013)

if sage_conf is not installed, because VERSION is defined there

Traceback (most recent call last):
  File "/usr/bin/sage-venv-config", line 29, in <module>
    _main()
  File "/usr/bin/sage-venv-config", line 17, in _main
    version='%(prog)s ' + VERSION)
NameError: name 'VERSION' is not defined

CC: @antonio-rojas @slel

Component: scripts

Author: Matthias Koeppe

Branch/Commit: 93a9fcf

Reviewer: Antonio Rojas

Issue created by migration from https://trac.sagemath.org/ticket/31058

[mkoeppe]

Description changed:

--- 
+++ 
@@ -1,2 +1,12 @@
 (from #30013)
 
+if `sage_conf` is not installed, because `VERSION` is defined there
+
+```
+Traceback (most recent call last):
+  File "/usr/bin/sage-venv-config", line 29, in <module>
+    _main()
+  File "/usr/bin/sage-venv-config", line 17, in _main
+    version='%(prog)s ' + VERSION)
+NameError: name 'VERSION' is not defined
+```

[mkoeppe]

Branch: u/mkoeppe/src_bin_sage_venv_config__do_not_fail_if_sage_conf_is_not_available

[mkoeppe]

Author: Matthias Koeppe

[mkoeppe]

Commit: 93a9fcf

[mkoeppe]

comment:3

Something like this should work

---

New commits:

93a9fcf

src/bin/sage-venv-config: Import VERSION from sage.version

[antonio-rojas]

comment:4

Thanks

[slel]

Reviewer: Antonio Rojas

[vbraun]

Changed branch from u/mkoeppe/src_bin_sage_venv_config__do_not_fail_if_sage_conf_is_not_available to 93a9fcf