fix install torch (#1247)

Author: pkufool

scripts/github_actions/install_torch.sh

@@ -14,7 +14,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-if [ $TORCH_VERSION != "" ] && [ $CUDA_VERSION != ""]; then
+if [ $TORCH_VERSION != "" ] && [ $CUDA_VERSION != "" ]; then
     torch=$TORCH_VERSION
     cuda=$CUDA_VERSION
 fi