refactor: add missing check & test case

---
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---

Author: headlessNode

lib/node_modules/@stdlib/blas/ext/find-index/lib/main.js

@@ -24,6 +24,7 @@ var hasOwnProp = require( '@stdlib/assert/has-own-property' );
 var isFunction = require( '@stdlib/assert/is-function' );
 var isPlainObject = require( '@stdlib/assert/is-plain-object' );
 var isndarrayLike = require( '@stdlib/assert/is-ndarray-like' );
+var getShape = require( '@stdlib/ndarray/shape' );
 var format = require( '@stdlib/string/format' );
 var base = require( './base.js' );
 
@@ -84,6 +85,7 @@ function findIndex( x ) {
 	var opts;
 	var ctx;
 	var cb;
+	var sh;
 
 	nargs = arguments.length;
 	if ( !isndarrayLike( x ) ) {
@@ -148,6 +150,11 @@ function findIndex( x ) {
 			opts.dtype = options.dtype;
 		}
 	}
+	// Resolve the list of non-reduced dimensions:
+	sh = getShape( x );
+	if ( sh.length < 1 ) {
+		throw new RangeError( 'invalid argument. First argument must have at least one dimension.' );
+	}
 	return base( x, opts, cb, ctx );
 }
 

lib/node_modules/@stdlib/blas/ext/find-index/test/test.assign.js

@@ -187,6 +187,30 @@ tape( 'the function throws an error if provided a first argument which is not an
 	}
 });
 
+tape( 'the function throws an error if provided a zero-dimensional input ndarray-like object', function test( t ) {
+	var values;
+	var i;
+	var y;
+
+	y = zeros( [], {
+		'dtype': 'int32'
+	});
+
+	values = [
+		[]
+	];
+	for ( i = 0; i < values.length; i++ ) {
+		t.throws( badValue( values[ i ] ), RangeError, 'throws an error when provided ' + values[ i ] );
+	}
+	t.end();
+
+	function badValue( value ) {
+		return function badValue() {
+			findIndex( zeros( value ), y, clbk );
+		};
+	}
+});
+
 tape( 'the function throws an error if provided a second argument which is not an ndarray-like object', function test( t ) {
 	var values;
 	var i;

lib/node_modules/@stdlib/blas/ext/find-index/test/test.main.js

@@ -165,6 +165,25 @@ tape( 'the function throws an error if provided a first argument which is not an
 	}
 });
 
+tape( 'the function throws an error if provided a zero-dimensional input ndarray-like object', function test( t ) {
+	var values;
+	var i;
+
+	values = [
+		[]
+	];
+	for ( i = 0; i < values.length; i++ ) {
+		t.throws( badValue( values[ i ] ), RangeError, 'throws an error when provided ' + values[ i ] );
+	}
+	t.end();
+
+	function badValue( value ) {
+		return function badValue() {
+			findIndex( zeros( value ), clbk );
+		};
+	}
+});
+
 tape( 'the function throws an error if provided a second argument which is not a function', function test( t ) {
 	var values;
 	var x;