make cmdline sigs optional for index (#1186)

* make cmdline sigs optional for index. In tests, fix index argument order to account for this change * update python 3.7 in travis Co-authored-by: Luiz Irber <[email protected]>
sourmash-bio · Aug 28, 2020 · 6e639bd · 6e639bd
1 parent 0a15553
commit 6e639bd
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diff --git a/.travis.yml b/.travis.yml
@@ -28,7 +28,7 @@ jobs:
   include:
     - &test
       stage: test
-      python: 3.7
+      python: 3.7.9
     - <<: *test
       python: 3.8
       env:
@@ -101,13 +101,13 @@ jobs:
         - redis
         - docker
     - <<: *test
-      python: 3.7
+      python: 3.7.9
       env:
         - TOXENV=docs
 
     - &wheel
       stage: build wheel and send to github releases
-      python: 3.7
+      python: 3.7.9
       services:
         - docker
       env:

diff --git a/sourmash/cli/index.py b/sourmash/cli/index.py
@@ -33,7 +33,7 @@ def subparser(subparsers):
                                       usage=usage)
     subparser.add_argument('sbt_name', help='name to save index into; .sbt.zip or .sbt.json file')
     subparser.add_argument(
-        'signatures', nargs='+',
+        'signatures', nargs='*',
         help='signatures to load into SBT'
     )
     subparser.add_argument(