[Fix] nvm install -b: when no binary is available, fail and output …

…a clear message

nvm.sh

@@ -3558,6 +3558,10 @@ nvm() {
           EXIT_CODE=$?
         else
           EXIT_CODE=-1
+          if [ $nosource -eq 1 ]; then
+            nvm_err "Binary download is not available for ${VERSION}"
+            EXIT_CODE=999
+          fi
         fi
 
         if [ $EXIT_CODE -ne 0 ]; then

test/fast/Unit tests/nvm install -b

@@ -0,0 +1,16 @@
+#!/bin/sh
+
+die () { echo "$@" ; exit 1; }
+
+\. ../../nvm.sh
+
+VERSION="0.7.0"
+
+EXIT_CODE=$(nvm install -b "${VERSION}" ; echo $?)
+
+[ $EXIT_CODE -eq 999 ] || die "Expected exit code 999, got ${EXIT_CODE}"
+
+ACTUAL="$(nvm install -b "${VERSION}" 2>&1)"
+EXPECTED="Binary download is not available for ${VERSION}"
+
+diff $ACTUAL $EXPECTED || die