Show help message when -i or -m is not set (#3144)

inference-engine/samples/benchmark_app/main.cpp

@@ -48,6 +48,7 @@ bool ParseAndCheckCommandLine(int argc, char *argv[]) {
     }
 
     if (FLAGS_m.empty()) {
+        showUsage();
         throw std::logic_error("Model is required but not set. Please set -m option.");
     }
 

inference-engine/samples/classification_sample_async/main.cpp

@@ -44,10 +44,12 @@ bool ParseAndCheckCommandLine(int argc, char *argv[]) {
     slog::info << "Parsing input parameters" << slog::endl;
 
     if (FLAGS_m.empty()) {
+        showUsage();
         throw std::logic_error("Model is required but not set. Please set -m option.");
     }
 
     if (FLAGS_i.empty()) {
+        showUsage();
         throw std::logic_error("Input is required but not set. Please set -i option.");
     }
 

inference-engine/samples/ngraph_function_creation_sample/main.cpp

@@ -36,10 +36,12 @@ bool ParseAndCheckCommandLine(int argc, char* argv[]) {
     }
 
     if (FLAGS_m.empty()) {
+        showUsage();
         throw std::logic_error("Path to a .bin file with weights for the trained model is required but not set. Please set -m option.");
     }
 
     if (FLAGS_i.empty()) {
+        showUsage();
         throw std::logic_error("Path to an image is required but not set. Please set -i option.");
     }
 

inference-engine/samples/object_detection_sample_ssd/main.cpp

@@ -37,10 +37,12 @@ bool ParseAndCheckCommandLine(int argc, char *argv[]) {
     slog::info << "Parsing input parameters" << slog::endl;
 
     if (FLAGS_m.empty()) {
+        showUsage();
         throw std::logic_error("Model is required but not set. Please set -m option.");
     }
 
     if (FLAGS_i.empty()) {
+        showUsage();
         throw std::logic_error("Input is required but not set. Please set -i option.");
     }
 

inference-engine/samples/style_transfer_sample/main.cpp

@@ -34,10 +34,12 @@ bool ParseAndCheckCommandLine(int argc, char *argv[]) {
     }
 
     if (FLAGS_m.empty()) {
+        showUsage();
         throw std::logic_error("Model is required but not set. Please set -m option.");
     }
 
     if (FLAGS_i.empty()) {
+        showUsage();
         throw std::logic_error("Input is required but not set. Please set -i option.");
     }